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Why disgust matters

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Why disgust matters

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Philosophical Transactions of the Royal Society B [ 0962-8436 ] ; 2011.

RBID : ISTEX:A9D8D3F534B0B665A9D63170503EA88FF56064BA

Abstract

The new synthesis about disgust is that it is a system that evolved to motivate infectious disease avoidance. There are vital practical and intellectual reasons why we need to understand disgust better. Practically, disgust can be harnessed to combat the behavioural causes of infectious and chronic disease such as diarrhoeal disease, pandemic flu and smoking. Disgust is also a source of much human suffering; it plays an underappreciated role in anxieties and phobias such as obsessive compulsive disorder, social phobia and post-traumatic stress syndromes; it is a hidden cost of many occupations such as caring for the sick and dealing with wastes, and self-directed disgust afflicts the lives of many, such as the obese and fistula patients. Disgust is used and abused in society, being both a force for social cohesion and a cause of prejudice and stigmatization of out-groups. This paper argues that a better understanding of disgust, using the new synthesis, offers practical lessons that can enhance human flourishing. Disgust also provides a model system for the study of emotion, one of the most important issues facing the brain and behavioural sciences today.

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https://api.istex.fr/ark:/67375/V84-8RS757BH-Z/fulltext.pdf

DOI: 10.1098/rstb.2011.0165

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ISTEX:A9D8D3F534B0B665A9D63170503EA88FF56064BA

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<front><div type="abstract">The new synthesis about disgust is that it is a system that evolved to motivate infectious disease avoidance. There are vital practical and intellectual reasons why we need to understand disgust better. Practically, disgust can be harnessed to combat the behavioural causes of infectious and chronic disease such as diarrhoeal disease, pandemic flu and smoking. Disgust is also a source of much human suffering; it plays an underappreciated role in anxieties and phobias such as obsessive compulsive disorder, social phobia and post-traumatic stress syndromes; it is a hidden cost of many occupations such as caring for the sick and dealing with wastes, and self-directed disgust afflicts the lives of many, such as the obese and fistula patients. Disgust is used and abused in society, being both a force for social cohesion and a cause of prejudice and stigmatization of out-groups. This paper argues that a better understanding of disgust, using the new synthesis, offers practical lessons that can enhance human flourishing. Disgust also provides a model system for the study of emotion, one of the most important issues facing the brain and behavioural sciences today.</div>
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<aff><addr-line>Department of Infectious and Tropical Diseases</addr-line>
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, <addr-line>Keppel Street, London WC1E 7HT</addr-line>
, <country>UK</country>
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<fn fn-type="other"><p>One contribution of 11 to a Theme Issue ‘<ext-link ext-link-type="uri" xlink:href="http://rstb.royalsocietypublishing.org/content/366/1583.toc">Disease avoidance: from animals to culture</ext-link>
’.</p>
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<abstract>

<p>The new synthesis about disgust is that it is a system that evolved to motivate infectious disease avoidance. There are vital practical and intellectual reasons why we need to understand disgust better. Practically, disgust can be harnessed to combat the behavioural causes of infectious and chronic disease such as diarrhoeal disease, pandemic flu and smoking. Disgust is also a source of much human suffering; it plays an underappreciated role in anxieties and phobias such as obsessive compulsive disorder, social phobia and post-traumatic stress syndromes; it is a hidden cost of many occupations such as caring for the sick and dealing with wastes, and self-directed disgust afflicts the lives of many, such as the obese and fistula patients. Disgust is used and abused in society, being both a force for social cohesion and a cause of prejudice and stigmatization of out-groups. This paper argues that a better understanding of disgust, using the new synthesis, offers practical lessons that can enhance human flourishing. Disgust also provides a model system for the study of emotion, one of the most important issues facing the brain and behavioural sciences today.</p>

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<sec id="s1" sec-type="intro"><label>1.</label>
<title>Introduction</title>

<p>The premise of the new synthesis about disgust is that it is an adaptive system that evolved to motivate disease-avoidance behaviour [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
–<xref ref-type="bibr" rid="RSTB20110165C7">7</xref>
]. It arose in our animal ancestors to facilitate the recognition of objects and situations associated with risk of infection and to drive hygienic behaviour, thus reducing micro- and macro-parasite contact. Sometime in our evolution towards human ultrasociality, disgust took on an extended role—providing a motive to punish antisocial behaviour and to shun the breakers of social rules [<xref ref-type="bibr" rid="RSTB20110165C8">8</xref>
,<xref ref-type="bibr" rid="RSTB20110165C9">9</xref>
]. Disgust is an adaptive system whereby individual responses vary according to an individual's personality and learning experience, as well as by local cultural effects such as norms about manners and the symbolism of pollution and purity [<xref ref-type="bibr" rid="RSTB20110165C7">7</xref>
]. This new synthesis replaces previous conceptions of disgust as, for example, a Freudian means of repudiating desired objects, such as the mother's breast or faeces [<xref ref-type="bibr" rid="RSTB20110165C10">10</xref>
], a psychodynamic balancing mechanism to refuse reminders of our animal nature [<xref ref-type="bibr" rid="RSTB20110165C6">6</xref>
,<xref ref-type="bibr" rid="RSTB20110165C11">11</xref>
,<xref ref-type="bibr" rid="RSTB20110165C12">12</xref>
] or as a social and cultural construction [<xref ref-type="bibr" rid="RSTB20110165C13">13</xref>
,<xref ref-type="bibr" rid="RSTB20110165C14">14</xref>
].</p>

<p>But why, in the end, does it matter that we understand how and why disgust evolved? Disgust impacts on many aspects of our lives, from our individual, domestic, everyday hygiene habits, through our moral choices as members of society, to public policy on issues such as health, justice, social exclusion and warfare. However, possibly because it is the part of our nature that deals with repulsion, disgust has received scant scientific attention until recently [<xref ref-type="bibr" rid="RSTB20110165C10">10</xref>
]. This special issue demonstrates how disgust is now proving a fertile ground for study by psychologists, zoologists and evolutionary biologists. Beyond the life sciences, it also provides rich matter for the humanities—in the social sciences, in history and classical studies, in politics, jurisprudence and marketing, as well as in the arts.</p>

<p>Clearly, the better we understand how and why disgust evolved and the part that it plays in our natures and in our societies, the better we will advance in all of these fields of intellectual endeavour. Such advances are important in themselves, but they also have practical repercussions. In this paper, I argue that there are three principal practical reasons why we need to better understand the biology of this ‘dark side’ of our nature.</p>

<p>First, as one of our principal defences against infection, disgust can be harnessed to efforts at improving health. It can be employed in programmes to prevent diarrhoeal diseases, pandemic flu and to aid smoking cessation, for example. Second, disgust has important implications for psychological welfare. It plays a role in obsessive compulsive and post-traumatic stress disorders (OCD and PTSD) and it is part of the emotional cost of caring for the sick, elderly and infirm. Stigmatization and self-directed disgust cause suffering in conditions such as obesity and fistula. Thirdly, disgust is a moral emotion that influences social behaviours. Its role in religion, justice, technological progress, caste, class, xenophobia and the politics of exclusion needs to be better understood if we are to create healthier and more humane societies.</p>

<p>Here I tackle each of these issues in turn and then draw out some of the questions that remain to be answered about this powerful but, still poorly understood emotion.</p>

</sec>

<sec id="s2"><label>2.</label>
<title>Disgust and disease control</title>

<p>The proper domain [<xref ref-type="bibr" rid="RSTB20110165C15">15</xref>
] of disgust is the avoidance of infectious disease [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
]. Despite major recent improvements in our understanding of the transmission, prevention and treatment of infectious disease, the problem is still with us. <xref ref-type="table" rid="RSTB20110165TB1">Table 1</xref>
 presents the major current and recent infectious disease threats to humans. Six conditions cause most deaths: diarrhoeal diseases, acute respiratory tract infections, malaria, measles, HIV and tuberculosis. Parasitic worms including schistosomes, hookworm, ascaris and the nematodes that cause lymphatic filariasis and oncocerciasis still infect one-third of the world's population [<xref ref-type="bibr" rid="RSTB20110165C16">16</xref>
]. Leprosy, polio, smallpox, plague and guinea worm were major causes of death and disability in previous centuries; they are now rare or eradicated, thanks to recent control efforts [<xref ref-type="bibr" rid="RSTB20110165C17">17</xref>
]. Measles, diphtheria and meningitis also cause far less mortality owing to recent advances in vaccination. Newly emerging or re-emerging infections such as Ebola, SARS, West Nile and Rift Valley fevers and pandemic influenza are a major cause for concern, as is the emergence of resistance to antibiotics and antimalarials. Not included in the table are the infections that have also been shown to play a role in many chronic diseases, including cancer, stroke, multiple sclerosis and cardiovascular disease [<xref ref-type="bibr" rid="RSTB20110165C18">18</xref>].

<table-wrap id="RSTB20110165TB1" position="float"><label>Table 1.</label>

<caption><p>Disgust, behaviour and the major causes of infectious disease.</p>
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<td>AIDS</td>

<td>human immunodeficiency virus</td>

<td>safe sex, avoid needle sharing</td>

<td>sexual fluids, body fluids, sickly person</td>

</tr>

<tr>

<td>acute respiratory tract infections</td>

<td><italic>Streptococcus pneumoniae, Haemophillus influenzae, Mycoplasma pneumoniae</italic>
</td>

<td>hand hygiene, respiratory hygiene, surface hygiene, proximity avoidance</td>

<td>nasal mucous, spittle, droplets, coughing, proximity and contact, contaminated fomites</td>

</tr>

<tr>

<td>diarrhoeal diseases</td>

<td>over 20 bacterial and viral agents including: <italic>Vibrio cholerae</italic>
, <italic>Shigella</italic>
 spp., <italic>Salmonella</italic>
 spp., <italic>Campylobacter enteritis</italic>
, <italic>Cryptosporidium</italic>
, <italic>Escherichia coli</italic>
</td>

<td>avoid faecal–oral transmission through hand hygiene, safe water consumption, safe disposal of faeces, safe food hygiene, surface hygiene, restrict animal contact</td>

<td>faeces, spoilt food, dirty water, vomitus, contaminated fomites, contaminated food</td>

</tr>

<tr>

<td>diphtheria</td>

<td><italic>Corynebacterium diptheriae</italic>
</td>

<td>avoid contact, fabric hygiene</td>

<td>sick person, soiled materials, nasal discharges</td>

</tr>

<tr>

<td>lymphatic filariasis</td>

<td><italic>Wucheraria bancrofti, Brugia malayi</italic>
</td>

<td>avoid being bitten by infected mosquitoes</td>

<td>signs of deformity</td>

</tr>

<tr>

<td rowspan="2">hepatitis (viral)</td>

<td>hepatitis A, E virus</td>

<td>faecal–oral: see diarrhoeal diseases</td>

<td>faeces, dirty water, vomitus, contaminated food and fomites</td>

</tr>

<tr>

<td>hepatitis B, C virus</td>

<td>safe sex, avoid close physical contact, avoid shared needles</td>

<td>blood, saliva, body fluids</td>

</tr>

<tr>

<td>leishmaniasis</td>

<td><italic>Leishmania tropica, Leishmania braziliensis</italic>
, <italic>Leishmania</italic>
 spp.</td>

<td>avoid sandfly bite, destroy vector breeding sites</td>

<td>rubbish heaps</td>

</tr>

<tr>

<td>leprosy</td>

<td><italic>Mycobacterium leprae</italic>
</td>

<td>contentious—avoid direct contact and nasal secretions</td>

<td>sick others, skin lesions, deformity, nasal mucous</td>

</tr>

<tr>

<td>malaria</td>

<td><italic>Plasmodium falciparum, Plasmodium ovale, Plasmodium malariae</italic>
 and <italic>Plasmodium</italic>
 spp.</td>

<td>avoid being bitten by infected mosquitoes, destroy breeding sites</td>

<td>—</td>

</tr>

<tr>

<td>measles</td>

<td>measles virus</td>

<td>isolation</td>

<td>rash, sores, nasal and throat secretions, and soiled items</td>

</tr>

<tr>

<td>meningitis</td>

<td><italic>Neisseria meningitides, Streptococcus pneumonia, Haemophilus influenzae</italic>
 type b (Hib)</td>

<td>avoid direct contact, nasal secretions</td>

<td>contact, nose and throat secretions</td>

</tr>

<tr>

<td>onchocerciasis (river blindness)</td>

<td><italic>Oncocerca volvulus</italic>
</td>

<td>avoid bite of <italic>Simulium</italic>
 blackfly, destroy breeding sites</td>

<td>flies</td>

</tr>

<tr>

<td>plague</td>

<td><italic>Yersinia pestis</italic>
</td>

<td>domestic hygiene, clothes hygiene, avoid sick animals</td>

<td>pustules, sick people, exudates, refuse, rats, fleas, sick animals</td>

</tr>

<tr>

<td>poliomyelitis</td>

<td>polio virus</td>

<td>faecal–oral: see diarrhoeal disease</td>

<td>faeces, throat secretions, soiled articles</td>

</tr>

<tr>

<td>rabies</td>

<td>rabies virus</td>

<td>avoid bite or scratch from infected animal</td>

<td>saliva, infected animal, dog, bat</td>

</tr>

<tr>

<td>schistosomiasis</td>

<td><italic>Schistosoma mansoni, Schistosoma haematobium, Schistosoma japonicum</italic>
</td>

<td>avoid wading into water, urinating in or defaecating near water</td>

<td>snails, stagnant water</td>

</tr>

<tr>

<td>smallpox</td>

<td>variola virus</td>

<td>case isolation, contact avoidance</td>

<td>pustules, rash, blood, droplets</td>

</tr>

<tr>

<td>staphylococcal skin infections (impetigo, carbuncles, abscesses etc.)</td>

<td><italic>Staphylococcus aureus</italic>
</td>

<td>skin hygiene, hand hygiene, clothes and toilet items hygiene</td>

<td>skin lesions, weeping sores, nasal discharges, soiled toilet articles</td>

</tr>

<tr>

<td>streptococcal infections (tonsillitis, scarlet fever, impetigo, septicaemia, otitis, wound infections, toxic shock, rheumatic heart disease)</td>

<td><italic>Streptococcus pyogenes</italic>
</td>

<td>hand hygiene, food hygiene, avoid skin contact, lesions</td>

<td>rash, fever, skin lesions, discharges, necrosis, vaginal secretions, respiratory droplets, skin contact, milk, meat</td>

</tr>

<tr>

<td>syphillis</td>

<td><italic>Treponema pallidum</italic>
</td>

<td>safe sex</td>

<td>rash, skin lesions, chancre, especially on genitals, exudates, insanity, prostitution</td>

</tr>

<tr>

<td>taenia (tape worm)</td>

<td><italic>Taenia solium, Taenia saginata</italic>
</td>

<td>avoid undercooked beef and pork, sanitation, handwashing</td>

<td>pig, cow, human faeces, worm eggs in meat</td>

</tr>

<tr>

<td>tetanus</td>

<td><italic>Clostridium tentani</italic>
</td>

<td>wound hygiene, safe childbirth practice</td>

<td>soil, dust, human and animal faeces</td>

</tr>

<tr>

<td>toxoplasmosis</td>

<td><italic>Toxoplasma gondii</italic>
</td>

<td>cook meat, wash vegetables, wash hands, avoid cat faeces</td>

<td>cat faeces, soil, dirt on food</td>

</tr>

<tr>

<td>tuberculosis</td>

<td><italic>Mycobacterium tuberculosis</italic>
</td>

<td>respiratory hygiene, minimize close contact, ventilation</td>

<td>nasal mucous, spittle, droplets, stale air, homeless</td>

</tr>

</tbody>

</table>

</table-wrap>
</p>

<p>While medical effort and attention has focused on the pathology of disease, and the search for vaccines and cures, measures to prevent the acquisition of infection in the first place have received less attention. Yet, as the table shows, avoidance behaviour is essential to prevent the spread of all of these conditions [<xref ref-type="bibr" rid="RSTB20110165C17">17</xref>
]. If hygiene is defined as disease-avoidance behaviour [<xref ref-type="bibr" rid="RSTB20110165C19">19</xref>
], then hygienic measures help to defend all of the principal portals of entry to the body. Safe excreta disposal, hand, food and water hygiene prevent the faecal–oral transmission of the diarrhoeal diseases including cholera, salmonelloses, as well as hepatitis A and E, polio and various worm infections. Avoiding sex with infected others helps prevent the transmission of HIV, syphilis and hepatitis B and C. Diseases that use the respiratory route such as tuberculosis, measles, influenza leprosy, diphtheria and respiratory tract infections are harder to prevent, but reducing proximity and contact with the sick hinders airborne transmission and the avoidance of contaminated fomites can help reduce infection risk [<xref ref-type="bibr" rid="RSTB20110165C20">20</xref>
]. Staphylococcal, streptococcal and tetanus infections can be prevented through body surface hygiene, especially by avoiding fluid transfer from and to skin lesions and from fomites. The body surface is also the route of injection of the infectious diseases that are carried by insect vectors, including malaria, onchocerciasis, leishmaniasis, typhus and yellow fever. Here, disease prevention means avoiding insect bites. Other vector-borne infections including rabies and toxoplasmosis can be prevented by avoiding contact with bats, rats, dogs and cats. A number of these infections have multiple routes of infection, especially the diseases of crowding (measles and tuberculosis).</p>

<p>The final column of <xref ref-type="table" rid="RSTB20110165TB1">table 1</xref>
 picks out items that have been cited as disgusting in various studies [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
,<xref ref-type="bibr" rid="RSTB20110165C2">2</xref>
]. There are a variety of disgust elicitors that relate to almost every infectious condition. For the faecal–oral infections, these include faeces, dirty water and contaminated foods; for the skin contact infections, skin lesions; for sexually transmitted diseases, ulcerated genitals and individuals who may be at high risk such as sex workers; for the respiratory infections, respiratory secretions and contaminated materials. Sick people and bodily secretions/excretions occasion disgust as the source of multiple possible infections. We have suggested elsewhere that most disgust elicitors can be incriminated in the transmission of infection from source to host and that this explains why they are found to be disgusting [<xref ref-type="bibr" rid="RSTB20110165C2">2</xref>
]. Those with lower disgust sensitivity are known to suffer from more infectious disease [<xref ref-type="bibr" rid="RSTB20110165C21">21</xref>
], and selective partner choice is an important, but underappreciated, factor in the spread of sexually transmitted infections [<xref ref-type="bibr" rid="RSTB20110165C22">22</xref>
].</p>

<p>Of course, the diseases of recent centuries may not be a perfect proxy for the diseases that shaped the disgust response in our pre-human and human evolutionary history. Diseases with their origins in the domestication of animals or in high-density urban settlement, for example, are thought to be more prevalent now than in ancestral times [<xref ref-type="bibr" rid="RSTB20110165C23">23</xref>
]. Nevertheless, the table shows a general pattern whereby hygienic behaviour with respect to disgust elicitors plays an essential role in the prevention of infection. These behaviours are ancient and ubiquitous, many of them are shared with our animal ancestors [<xref ref-type="bibr" rid="RSTB20110165C24">24</xref>
] and are not contingent on recent scientific knowledge about the behaviour of the agents of infectious disease. Indeed, the idea of contacting or consuming infectious substances such as saliva, faeces or vomit, or of intimate contact with those known to be carrying infection is deeply uncomfortable to even contemplate. Self-limitation of such behaviour is so automatic and intuitive that it is often ignored as the front-line in our defence against disease.</p>

<p>Without disgust and the hygienic behaviours it elicits, then, infectious diseases would cause far more morbidity and mortality in our own—and in all free-living animal—species. (There is one notable exception to this pattern. No disgust elicitor is involved in the insect-vectored infections such as malaria and oncocerciasis. Perhaps the adaptive response to a bite is not disgust, but to slap away the offending insect, or, alternatively, perhaps ancestral conditions were such that it was impossible to gain an adaptive advantage from insect bite-avoidance behaviour [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
].)</p>

<p>Disgust therefore plays a major role in public health. How can this knowledge be exploited in programmes to control disease? Where disgust reactions are appropriate to modern conditions they can be elicited. In cases where they are inappropriate, efforts can be made at redirection. Further, disgust can also be employed to help improve health beyond the domain of infectious disease.</p>

<p>Take, for example, the diseases that are transmitted via the faecal–oral route. Though the situation is improving, diarrhoeal diseases still kill an estimated 1.5 million children every year [<xref ref-type="bibr" rid="RSTB20110165C25">25</xref>
]. Human faeces are the main source of infection [<xref ref-type="bibr" rid="RSTB20110165C26">26</xref>
]. Evidence suggests that handwashing with soap, were it practised globally, could save over a million lives a year, mainly from the infectious enteric diseases [<xref ref-type="bibr" rid="RSTB20110165C27">27</xref>
]. It can also prevent respiratory infections [<xref ref-type="bibr" rid="RSTB20110165C28">28</xref>
], including pandemic flu [<xref ref-type="bibr" rid="RSTB20110165C20">20</xref>
], infectious blinding trachoma [<xref ref-type="bibr" rid="RSTB20110165C29">29</xref>
], AIDS-associated infections [<xref ref-type="bibr" rid="RSTB20110165C31">30</xref>
] and potentially reduce malnutrition [<xref ref-type="bibr" rid="RSTB20110165C31">31</xref>
]. Handwashing with soap is, however, a rare practice. Direct observation showed that only 3 per cent of mothers in Ghana, 4 per cent in Madagascar, 12–14% in China, Tanzania and Uganda and 18 per cent in Kyrgyzstan [<xref ref-type="bibr" rid="RSTB20110165C32">32</xref>
] were washing their hands with soap after using the toilet. In the UK, we found that only 43 per cent of mothers washed their hands with soap after changing a dirty nappy [<xref ref-type="bibr" rid="RSTB20110165C33">33</xref>
] and electronic sensors showed that only 32 per cent of men and 64 per cent of women washed their hands with soap after using a public toilet [<xref ref-type="bibr" rid="RSTB20110165C34">34</xref>
]. Formative research studies into the reasons why people washed their hands found motives that included comfort, nurture, status and attraction. However, disgust at the idea that faecal material might be present on hands was consistently reported as the most powerful motivator of handwashing with soap after going to the toilet [<xref ref-type="bibr" rid="RSTB20110165C32">32</xref>
]. This information was employed in the development of a national handwashing campaign in Ghana. TV and radio commercials were designed to graphically highlight the contamination of hands and to show how invisible matter could be transferred to foods that were being eaten by children [<xref ref-type="bibr" rid="RSTB20110165C35">35</xref>
]. The campaign improved nationally reported rates of handwashing with soap by 13 per cent after the toilet and by 41 per cent before eating [<xref ref-type="bibr" rid="RSTB20110165C36">36</xref>
]. Similar improvements in hand hygiene were achieved in a social marketing campaign in Burkina Faso that used disgust-based messages, amongst others [<xref ref-type="bibr" rid="RSTB20110165C37">37</xref>
]. An image of a bacteria-ridden hand used as a screen saver in a Los Angeles hospital reportedly improved staff handwashing practices dramatically [<xref ref-type="bibr" rid="RSTB20110165C38">38</xref>
].</p>

<p>Disgust has been evoked to promote handwashing in more controlled conditions. Porzig-Drummond <italic>et al</italic>
. showed that adding disgust-relevant images to educational films and posters improved handwashing rates above the effect of education alone both in the laboratory and in the public washrooms [<xref ref-type="bibr" rid="RSTB20110165C39">39</xref>
]. Judah <italic>et al</italic>
. displayed a variety of messages at the entrance to a public toilet and found that disgust-based messages such as ‘soap it off or eat it later’ were among the most effective in increasing soap use, especially in men [<xref ref-type="bibr" rid="RSTB20110165C34">34</xref>
].</p>

<p>Disgust featured in the UK Government response to the threat of a pandemic of H1N1 influenza in 2009/2010. The cover image of an information leaflet delivered to every household in the UK (see <uri xlink:href="http://www.dh.gov.uk/prod_consum_dh/groups/dh_digitalassets/@dh/@en/documents/digitalasset/dh_098680.pdf">http://www.dh.gov.uk/prod_consum_dh/groups/dh_digitalassets/@dh/@en/documents/digitalasset/dh_098680.pdf</uri>
; [<xref ref-type="bibr" rid="RSTB20110165C41">41</xref>
]) to raise awareness of hand and respiratory hygiene explicitly depicts the aerosol spread of bodily secretions in a sneeze coming directly towards the viewer. Exposure to the campaign material was associated with increases in hygienic behaviour, such as the purchase of antibacterial hand gel, though the specific effect of the disgust component was not explicitly evaluated [<xref ref-type="bibr" rid="RSTB20110165C29">29</xref>
].</p>

<p>Mass media is, of course, not the only source of individual learning about disgust and hygiene. Children throughout the world are socialized into hygiene rules at an early age by parents, family, school and the wider community [<xref ref-type="bibr" rid="RSTB20110165C7">7</xref>
,<xref ref-type="bibr" rid="RSTB20110165C41">41</xref>
]. Children learn to bathe and groom themselves, especially before social interaction, to avoid sharing toilet articles, to avoid wearing night clothes in public, where (and where not) to defecate, to use a handkerchief and to eat ‘politely’ without exchange of bodily fluids. Individuals who do not display continence with their own emanations are regarded as having ‘bad manners’ and are denied the benefits of social interaction [<xref ref-type="bibr" rid="RSTB20110165C42">42</xref>
]. Having well-mannered children is an important aspiration for mothers in most societies [<xref ref-type="bibr" rid="RSTB20110165C32">32</xref>
]. Though the subject has been little investigated, it appears that mothers recruit disgust to teach their children how to behave, pulling disgust faces and making appropriate ‘yuk’ noises as children ‘make messes’. The process is aided by a predisposition or preparedness [<xref ref-type="bibr" rid="RSTB20110165C43">43</xref>
–<xref ref-type="bibr" rid="RSTB20110165C45">45</xref>
] to learn disgust of bodily fluids. The fact that failing to display continence with bodily fluids is socially unacceptable was exploited in a graphic television commercial for the Florida Department of Health, where one character sneezes over food, surface, hands and workmates, causing colleagues to demonstrate their disgust at these lapses in respiratory manners [<xref ref-type="bibr" rid="RSTB20110165C46">46</xref>
]. In our public toilet study using unobtrusive sensors, we found that rates of handwashing decreased when there were few people in the facility, and the message that had the biggest positive effect was: ‘Is the person next to you washing hands with soap?’ [<xref ref-type="bibr" rid="RSTB20110165C34">34</xref>
]. Manners are a subject about which almost nothing has been written in the academic press, yet understanding them better might prove fruitful in the quest to prevent the person-to-person spread of infection.</p>

<p>Whilst disgust of nasal emanations and of people who spread them is probably an appropriate and adaptive reaction to the threat of pandemic influenza [<xref ref-type="bibr" rid="RSTB20110165C47">47</xref>
], disgust responses can sometimes be unhelpful to public health. The disgust system operates by the precautionary principle whereby it is better to miss one meal than to run the risk of contracting a life-threatening disease [<xref ref-type="bibr" rid="RSTB20110165C48">48</xref>
,<xref ref-type="bibr" rid="RSTB20110165C49">49</xref>
]. Hence responses can be disproportionate to actual risk. The food industry is regularly affected by contamination scares that can lead to huge, but temporary shifts away from purchasing meat products, eggs or chocolate, for example [<xref ref-type="bibr" rid="RSTB20110165C50">50</xref>
]. The French public reduced their consumption of beef in response to emotive stories in the press about what could happen if you ate ‘mad cow’ [<xref ref-type="bibr" rid="RSTB20110165C51">51</xref>
]. A study of public reactions to a hypothetical outbreak of pneumonic plague found that people were likely to want to avoid health centres, when attending would have been beneficial to their health [<xref ref-type="bibr" rid="RSTB20110165C52">52</xref>
]. In California, public protestations of disgust have derailed projects for converting wastewater into drinking water [<xref ref-type="bibr" rid="RSTB20110165C53">53</xref>
].</p>

<p>While disgust's proper domain is that of infectious disease, it has also been employed in efforts to tackle other public health problems, most notably smoking. Cessation campaigns have used disgust freely. For example, the British Heart Foundation's most successful media campaign entitled ‘Give up before you clog up’ graphically depicted the impact of smoking on arteries by showing cigarettes apparently dripping globs of fat [<xref ref-type="bibr" rid="RSTB20110165C54">54</xref>
]. The World Health Organization now recommends the use of graphic images of diseased organs on cigarette packs. A Canadian study showed that the greater the disgust reported at such pictures, the greater the likelihood that participants would have attempted to, or succeeded in, quitting [<xref ref-type="bibr" rid="RSTB20110165C55">55</xref>
].</p>

<p>Disgust appears to have played a role in what Rozin calls the ‘moralization’ of smoking, which has become disgusting because it has been linked to contamination and disease. Individuals then display strong aversion to even minimal contact with the offensive substance (refusing smokers hotel rooms, for example). Rozin notes, ‘when disgust becomes linked to an entity or activity, rejection or avoidance of that activity becomes highly motivated and internalized’. He found that moral reactions to smoking depended more on how disgusting than on how unhealthy it was perceived to be [<xref ref-type="bibr" rid="RSTB20110165C56">56</xref>
]. The modern practice of relegating smokers to the outside of public buildings reinforces the rejection of the disgusting practice and the stigmatization of the individual as antisocial.</p>

<p>Food-related disgust can be employed to combat obesity. In a UK TV show, all of the snack and junk food typically eaten by one school class was piled into one huge disgusting heap to highlight the poor quality of children's diets [<xref ref-type="bibr" rid="RSTB20110165C57">57</xref>
]. This helped to spur the UK government to improve the quality of school dinners. Variations on this idea, such as graphic displays of the fat and sugar content of common food items, could help to harness disgust to healthy eating campaigns. One could imagine further uses of disgust targeted at obesity or at unsafe sex, for example. However, disgust has to be employed responsibly, as it can encourage moralization and stigmatization, as we have seen.</p>

</sec>

<sec id="s3"><label>3.</label>
<title>Disgust and psychological welfare</title>

<p>Disgust is a strong and visceral emotion that can arouse powerful affective and behavioural responses. While the emotion arose to defend against infectious disease, it can also cause maladaptive behaviour, interfering with the ability to lead a normal life. Some problems are associated with pathologies of the disgust system. Others may be due to disgust's ‘normal’ functioning in the context of an abnormal or novel environment. Further, some professions require the suppression of disgust, which could be regarded as a psychological cost that has to be borne by those individuals—and by society as a whole.</p>

<p>Disgust sensitivity varies from one individual to another along a continuum [<xref ref-type="bibr" rid="RSTB20110165C58">58</xref>
]. We might expect then that individuals at the very high, or very low ends of the spectrum might manifest behavioural problems associated with being too easily or too little disgusted. Those who are too easily disgusted might be predicted to manifest phobias associated with potential disease sources such as other people, body products, sexual organs and by-products, certain foodstuffs and disease-related animals. Those who are, on the contrary, too little disgusted might find difficulty in being accepted into society and in maintaining bodily and domestic hygiene, with implications for their own health and that of their dependants. Unfortunate disgust experiences might also leave unpleasant or debilitating sequelae including post traumatic stress disorder (PTSD).</p>

<p>How far does the evidence bear out these predictions? A number of studies suggest that some forms of obsessive compulsive disorder (OCD) can best be understood as disorders of the disgust system [<xref ref-type="bibr" rid="RSTB20110165C59">59</xref>
]. Up to 50 per cent of OCD patients present with contamination fears [<xref ref-type="bibr" rid="RSTB20110165C60">60</xref>
]. They suffer from intrusive thoughts of contamination and impurity and reduce their distress by excessive sanitation and disinfection of the self and the environment [<xref ref-type="bibr" rid="RSTB20110165C61">61</xref>
]. These patients tend to rate contaminated objects as ‘disgusting’ rather than ‘frightening’ [<xref ref-type="bibr" rid="RSTB20110165C62">62</xref>
]. In one memorable experiment, Tolin and colleagues created a chain of contagion where a pencil was touched to a toilet bowl and then wiped on another pencil, and that one onto another in sequence. ‘Normal’ participants, and those with chronic anxiety, reported diminishing contamination that had largely disappeared by the fourth pencil. However, the OCD patients reported appreciable contamination even beyond the tenth pencil. They described a world of spreading, looming vulnerability where they cannot control the threat of contagion [<xref ref-type="bibr" rid="RSTB20110165C62">62</xref>
]. As OCD occurs along a continuum of severity, it is likely that for every individual who seeks help, there will be many more borderline individuals who suffer from some form of debilitating contamination anxiety.</p>

<p>It might be expected that contamination anxiety would become more severe when disease reminders become more prevalent, for example, during epidemics [<xref ref-type="bibr" rid="RSTB20110165C63">63</xref>
]. Indeed, contamination fears and washing rituals were exacerbated in OCD patients during the recent H1N1 swine flu pandemic [<xref ref-type="bibr" rid="RSTB20110165C64">64</xref>
]. Planners need to bear in mind the possible social costs of pandemic awareness campaigns and consider the need for additional support services.</p>

<p>As ultrasocial beings, humans depend on others for survival, yet others are also the main source of infectious disease. Overactive disgust responses may play a role in some forms of social phobia. Though most goes unreported, at any one time 4.5 per cent of Americans may be suffering from social phobias and 2.3 per cent from agoraphobia [<xref ref-type="bibr" rid="RSTB20110165C65">65</xref>
]. Symptoms of both include an abnormal unwillingness to venture into crowds and to contact other people. The evidence is equivocal as to whether disgust plays a role—while agoraphobics have heightened disgust sensitivity [<xref ref-type="bibr" rid="RSTB20110165C66">66</xref>
] and agoraphobia is twice as common in women than it is in men (consistent with female disgust sensitivity being higher on average than it is for men [<xref ref-type="bibr" rid="RSTB20110165C2">2</xref>
]), one study found no heightened disgust sensitivity in social phobia (possibly because an instrument measuring only food-related disgust was employed) [<xref ref-type="bibr" rid="RSTB20110165C66">66</xref>
].</p>

<p>A variety of other debilitating specific phobias are also candidates for pathologies of the disgust system. Blood-injection-injury phobia is characterized by extreme aversion to the sight of blood, injuries, or surgical procedures including injections. Sufferers have higher disgust sensitivity, rate disgusting images as more disgusting than controls and display stronger facial expressions of disgust [<xref ref-type="bibr" rid="RSTB20110165C67">67</xref>
]. A variety of small animal and insect phobias are also potentially disgust-related. Animals that have connections with disease and dirt are much more likely candidates for phobias and childhood fears than those that do not (e.g. spiders, rats, worms, maggots, cockroaches and teeming insects [<xref ref-type="bibr" rid="RSTB20110165C68">68</xref>
]). Recent research also suggests that disgust is a stronger predictor than anxiety of spider avoidance [<xref ref-type="bibr" rid="RSTB20110165C69">69</xref>
]. Trichotillomania may also be disgust-related; pulling out skin hairs may be an exaggerated response to the possible presence of ectoparasites in skin—a hypothesis that has some support in the literature [<xref ref-type="bibr" rid="RSTB20110165C70">70</xref>
].</p>

<p>Clinical observation suggests that disgust is a primary feature of eating disorders such as anorexia and bulimia [<xref ref-type="bibr" rid="RSTB20110165C10">10</xref>
]. While some studies have shown correlations between measures of disgust sensitivity and of eating disorders [<xref ref-type="bibr" rid="RSTB20110165C71">71</xref>
,<xref ref-type="bibr" rid="RSTB20110165C72">72</xref>
]), others have failed to find such associations [<xref ref-type="bibr" rid="RSTB20110165C66">66</xref>
,<xref ref-type="bibr" rid="RSTB20110165C73">73</xref>
]. Disgust with the shape of one's own body is often a feature of eating disorders, and indeed obesity does tend to be seen as disgusting [<xref ref-type="bibr" rid="RSTB20110165C74">74</xref>
,<xref ref-type="bibr" rid="RSTB20110165C75">75</xref>
]. Meat is one of the most likely sources of pathogens in food and is also a particular focus of food-related disgust. It is therefore unsurprising that most cultures have taboos about what meats are suitable to eat and many cultures and sub-cultures such as Hindus and vegetarians/vegans reject it entirely [<xref ref-type="bibr" rid="RSTB20110165C76">76</xref>
].</p>

<p>As sexual acts, body parts and products are a focus of disgust, one might expect pathologies of the disgust system to affect sexual function. Though the problem has been little studied, several authors report that disgust is implicated in undermining sexual arousal and desire [<xref ref-type="bibr" rid="RSTB20110165C77">77</xref>
,<xref ref-type="bibr" rid="RSTB20110165C78">78</xref>
]. De Jong <italic>et al</italic>
. [<xref ref-type="bibr" rid="RSTB20110165C77">77</xref>
] present case studies of women who had turned disgust on themselves; associating dirt, disease, fistula and defaecation problems with their vagina which led to an inability to face intercourse.</p>

<p>Disgust may also play a role in the decision to remain celibate. The problem is described by one ex-celibate, the UK broadcaster Stephen Fry:<disp-quote>

<p>‘I would be greatly in the debt of the man who could tell me what would ever be appealing about those damp, dark, foul-smelling and revoltingly tufted areas of the body that constitute the main dishes in the banquet of love… …Once under the influence of the drugs supplied by one's own body, there is no limit to the indignities, indecencies, and bestialities to which the most usually rational and graceful of us will sink’ [<xref ref-type="bibr" rid="RSTB20110165C79">79</xref>
].</p>
</disp-quote>
</p>

<p>If the psychological problems we have discussed above are pathologies of the disgust system, then comorbidities are also to be expected. Monteiro <italic>et al</italic>
. [<xref ref-type="bibr" rid="RSTB20110165C80">80</xref>
] found that 24 per cent of patients with untreated OCD were virgins and another 9 per cent had not been sexually active for years. Of their 25 patients, seven who reported sexual problems also suffered from extreme shyness, suggesting possible social phobia comorbidity with OCD.</p>

<p>If sexual, social, contamination, blood injury and food-related phobias may, at least partly, be explained as maladaptive disorders of an evolved disease-avoidance system, another class of disgust-related psychological disorders can be classed as adaptive responses to a hostile environment. In particular, it seems that one class of PTSD may result from extreme experiences associated with disgust. Olatunji <italic>et al</italic>
. [<xref ref-type="bibr" rid="RSTB20110165C81">81</xref>
] showed that rape victims with PTSD suffer from feelings of dirtiness associated with mental pollution. Victims of childhood sexual abuse and survivors of torture may suffer in similar ways. Dalgleish and Power provide case histories where extremely disgusting events such as encounters with decomposed corpses in war or at work, or biological contaminants in food lead to intrusive thoughts, flashbacks, recurrent nausea, feelings of dirtiness that cannot be removed by washing and other manifestations that can leave patients unable to lead a normal life [<xref ref-type="bibr" rid="RSTB20110165C82">82</xref>
].</p>

<p>If the clinical and subclinical conditions that I have described are indeed disgust system disorders, then practical implications follow. First of all, accurate diagnosis is required, and seeing such problems as potentially disgust-related can help to hone the instruments of diagnosis. Secondly, many of these conditions occur on a sliding scale in the population, and many are associated with shame and an extreme reluctance to disclose or present to health services; hence much suffering goes undiagnosed and unaided. Health workers need to be well-briefed to detect hints of these conditions and to look for comorbidities, for example, for sexual dysfunction in those presenting with OCD. Internet-based support for such conditions may be more acceptable to many than face-to-face interaction [<xref ref-type="bibr" rid="RSTB20110165C77">77</xref>
].</p>

<p>Thirdly, there are many approaches to treatment both through behavioural and drug therapies. A systematic look at what has worked in each of these conditions through the lens of disgust might reveal effective therapies. For example, we know that cognitive reappraisal is possible. Just as rotting milk can be relabelled as yoghurt and so becomes palatable, de Jong suggests that exercises aimed at reconstructing sexual organs, not as smelly and dirty, but as examples of exquisite design could be effective in reducing sexual phobias [<xref ref-type="bibr" rid="RSTB20110165C83">83</xref>
]. Work is needed to determine whether behavioural therapies such as Exposure with Response Prevention and microbiological experiments demonstrating the lack of organisms on objects perceived to be contaminated [<xref ref-type="bibr" rid="RSTB20110165C62">62</xref>
] are effective. Cognitive behavioural therapy involving habituation to disgust objects and extinction along with the formation of new and positive associations could be used across these phobias, possibly with the addition of cortisol, which has been shown to enhance the consolidation of newly learnt memories [<xref ref-type="bibr" rid="RSTB20110165C77">77</xref>
]. Drug therapies might also focus on the possible implication of serotonin pathways in disgust [<xref ref-type="bibr" rid="RSTB20110165C84">84</xref>
].</p>

<p>Finally, research suggests that the disgust system is made up of a series of components that relate to different types of disease threat (sexual, hygiene, blood-and-guts, food, sick people, animals/insects, etc.; [<xref ref-type="bibr" rid="RSTB20110165C86">85</xref>
]). It seems likely that each type of threat has its own type of phobia. The disgust scales in current use [<xref ref-type="bibr" rid="RSTB20110165C86">86</xref>
–<xref ref-type="bibr" rid="RSTB20110165C88">88</xref>
] are based on psychodynamic conceptions of disgust that predate the new evolutionary synthesis [<xref ref-type="bibr" rid="RSTB20110165C89">89</xref>
] or do not distinguish between types of organic disgust [<xref ref-type="bibr" rid="RSTB20110165C6">6</xref>
]. We are currently preparing a new scale based on the discrete disease-avoidance tasks of disgust which should have more power to help in distinguishing the discrete pathologies of disgust subsystems.</p>

</sec>

<sec id="s4"><label>4.</label>
<title>The social uses and abuses of disgust</title>

<p>While disgust is the primary means by which individual humans detect and avoid infectious pathogens, the problem is not just an individual one. Parasites tend to specialize in exploiting the particular biochemical and morphological features of their hosts, making parasite transmission most likely between biologically similar organisms. Social animals thus face a conundrum; sociality brings fitness benefits, but at the same time it carries an elevated risk of infectious disease. For an ultrasocial species, such as humans, the problem is more acute, as parasites adapt to take advantage of sustained social proximity and interaction. Individuals have to protect themselves and their kin from parasites that have evolved to take every transmission opportunity. Appropriate disease-avoidance strategies thus include preferring to mix with insiders (ethnocentrism), avoiding outsiders (xenophobia), excluding any individuals that show signs of infection (shunning) or punishing those that behave in ways that may threaten others with disease, by displaying poor hygiene, for example. So as not to be punished or excluded, individuals self-police their own hygiene and social contact behaviour, sometimes turning disgust on themselves (shame). Group norms of hygiene behaviour (manners) may emerge and groups may agree to cooperate on activities that protect the group as a whole (public health). Because disgust is ‘strong magic’ that recognizes an ability to contaminate by association, it is used to marginalize outsiders to groups (stigmatization) and is employed in ritual and religion to demarcate what is pure and what is polluted. There is some evidence that disgust plays a role in morality, as much anti-social behaviour, as a form of social parasitism, is met with disgust. The workings of disgust as an adaptive system for disease avoidance in social groups have been discussed at length in a recent paper [<xref ref-type="bibr" rid="RSTB20110165C7">7</xref>
]. Here, I am concerned with the practical implications.</p>

<p>There is much evidence that humans tend to shun other individuals that display signs of disease, as do ants, fish [<xref ref-type="bibr" rid="RSTB20110165C90">90</xref>
,<xref ref-type="bibr" rid="RSTB20110165C91">91</xref>
], bullfrogs [<xref ref-type="bibr" rid="RSTB20110165C92">92</xref>
], mice [<xref ref-type="bibr" rid="RSTB20110165C93">93</xref>
], lobsters [<xref ref-type="bibr" rid="RSTB20110165C94">94</xref>
] and chimps [<xref ref-type="bibr" rid="RSTB20110165C95">95</xref>
]. Human faces made up to look sick are found to be more disgusting than healthy counterparts [<xref ref-type="bibr" rid="RSTB20110165C2">2</xref>
]. Individuals perceived to have disabilities or disfigurements automatically activate disease-relevant cognitions, even when perceivers are explicitly aware that these individuals do not harbour contagious diseases [<xref ref-type="bibr" rid="RSTB20110165C96">96</xref>
,<xref ref-type="bibr" rid="RSTB20110165C97">97</xref>
]. A hypervigilant disgust may be triggered implicitly by a range of conditions that may, or may not, be associated with risk of infection, such as epilepsy, mental illness, mental retardation, obesity, skin conditions such as psoriasis, cancer and HIV [<xref ref-type="bibr" rid="RSTB20110165C98">98</xref>
]. People who are more concerned with disease are less likely to have friends with disabilities [<xref ref-type="bibr" rid="RSTB20110165C99">99</xref>
], to dislike obese individuals more [<xref ref-type="bibr" rid="RSTB20110165C75">75</xref>
] and to display implicit ageism [<xref ref-type="bibr" rid="RSTB20110165C100">100</xref>
]. Having a psychology that is hypervigilant to cues as to who might be carrying an infectious illness means that we are particularly sensitive to socially acquired information about who is sick. Power-seeking individuals can exploit this fact. A common tactic for the playground bully, for example, is to label another child as infected or as having ‘cooties’; the victim then suffers shunning by their peer group.</p>

<p>Damaging as this can be to the individuals who are the subject of suspicion, stigmatization extends the problem of the labelling of individuals as diseased to whole groups. Out-groups, already a subject of suspicion because they could be carrying novel infections to which the in-group has not previously been exposed [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
], can be especially easily labelled as disease carriers. A body of work has recently emerged that links parasite stress to assortative sociality (reviewed by Fincher & Thornhill [<xref ref-type="bibr" rid="RSTB20110165C101">101</xref>
]). Cultural groups that have historically faced high rates of parasite stress tend to be more xenophobic, have stronger family ties, and have more languages, ethnic groups and religions. There are a number of possible explanations for why this may be the case and confounding factors cannot be ruled out. However, it is clear that, throughout history, in-groups have been able to bolster groupishness by labelling members of out-groups as polluting, dirty, unhygienic, disease-carriers, so justifying caste and class divisions, cruelty, exploitation, pogroms, ethnic cleansing, genocide and war [<xref ref-type="bibr" rid="RSTB20110165C102">102</xref>
]. Such problems persist globally because the old tricks still work. The powerful continue to exploit our inherent tendencies to cleave to the in-group in the face of a disease threat from the outside. Intercommunal violence and discussion of immigration hence peak at election times [<xref ref-type="bibr" rid="RSTB20110165C103">103</xref>
,<xref ref-type="bibr" rid="RSTB20110165C104">104</xref>
].</p>

<p>Because access to social life is so fundamental to our species, we are predisposed to learn not to inflict our own infectious emanations on others. We learn ‘good manners’ early; covering our mouths when we cough and respecting designated defaecation locations, for example [<xref ref-type="bibr" rid="RSTB20110165C7">7</xref>
]. Failures in this department lead to a feeling of shame. Shame also leads those with conditions that they perceive as possibly infecting and hence repulsive to others to sequester themselves. Acne can cause shame and poor self image [<xref ref-type="bibr" rid="RSTB20110165C105">105</xref>
], and fistula can lead sufferers to remove themselves from the society for fear of causing offence [<xref ref-type="bibr" rid="RSTB20110165C106">106</xref>
]. Incontinence sufferers feel humiliated, as one doctor recounted from his own experience:<disp-quote>

<p>To lay in bed, and against all physical rules, and I may say psychological rules as well, and do what you normally do at the toilet was a humiliating experience of the helplessness patients feel when help with basic functions is needed. Why did I never question this part of caring when I worked as a doctor? For us, defaecation was only an abstract category in the patient's medical record [<xref ref-type="bibr" rid="RSTB20110165C107">107</xref>
].</p>
</disp-quote>
</p>

<p>A common fear among terminally ill people is that of losing control over their physical functions. Isaksen [<xref ref-type="bibr" rid="RSTB20110165C108">108</xref>
] suggests that this fear is based on becoming ‘dirty’ and hence ‘untouchable’ because of the fears that bodily fluids evoke in others. While the old, the frail, the sick and the disabled, who have to hand their body care to others, fear the disgust that they may occasion, overcoming revulsion of body products is one of the issues faced by carers. When the carer is a partner, this can put an extreme stress on the relationship [<xref ref-type="bibr" rid="RSTB20110165C109">109</xref>
] and is part of the, often unrecognized, emotional cost of caring [<xref ref-type="bibr" rid="RSTB20110165C110">110</xref>
].</p>

<p>Like the sick, carers face a double whammy, in having not just to deal with the products of sickness but with social stigmatization. Individuals whose work involves contact with body products, hair, feet, sewage, used clothes, wastes and dead bodies tend to be poorly rewarded and suffer low status, perhaps because the nature of the work is perceived to contaminate the individual. Though common throughout the world, it is in the Hindu caste system where such occupational pollution is most visible—and damaging—despite recurrent efforts at reform [<xref ref-type="bibr" rid="RSTB20110165C111">111</xref>
]. Those that campaign against abortion, homosexuality and genetically modified foods exploit the imagery and language of disgust and its ability to contaminate; they employ pictures of aborted foetuses, talk of ‘dirty’ sexual practices and raise the spectre of ‘Frankenfoods’. By labelling the outsider as dirty and diseased, racists and nationalists find that they can also, to some extent, recruit morality to their side [<xref ref-type="bibr" rid="RSTB20110165C112">112</xref>
]. The best defence against such manipulative tactics is first, to understand what is happening, and second, to expose such strategies to the light of public revulsion.</p>

<p>Although disgust plays a key role in protecting us from disease, it is also responsible for much human suffering. Our evolved psychological defences against parasites are a double-edged sword. On the one hand, they provide the first line of defence against infection in social interaction. But at the same time they prevent social interaction, often at a time when it is most needed. Individuals who are sick or who have become contaminated by association, real or imagined, find themselves the subject of involuntary disgust reactions from others, facing disdain, suspicion and sometimes exclusion. Unscrupulous individuals make political capital from blaming and stigmatizing victims and the groups to which they belong, and the victims often turn blame and disgust on themselves.</p>

<p>What can be done to prevent or reverse this unhappy cycle? The recent story of the response to the HIV pandemic holds lessons that give some cause for optimism. First, irrational fears of contamination were, in early days, recognized as a factor in the social response to the disease and the public was educated that victims were not contagious and did not pose a threat to the general population [<xref ref-type="bibr" rid="RSTB20110165C113">113</xref>
]. Groups that were particularly affected, such as homosexuals and sex workers, recognized that a process of stigmatization was underway and organized attempts to combat it. They refused collective stigma by declaring their individuality, for example through artistic productions such as plays, films, literature and events [<xref ref-type="bibr" rid="RSTB20110165C114">114</xref>
]. They supported one another to publicly refuse to accept shame and self-blame. Political activists, patients, academics and health professionals worked together to change public opinion about HIV and AIDS [<xref ref-type="bibr" rid="RSTB20110165C115">115</xref>
]. While the problem has not been fully solved—those living with HIV still suffer from stigma, exclusion and sometimes violence—the public debate and the political response did much to reduce the suffering of the affected and, beyond this, to raise general awareness of the social effects of infectious disease.</p>

</sec>

<sec id="s5"><label>5.</label>
<title>Moral disgust</title>

<p>There are a number of lines of argument that link disgust to our implicit sense of morality. Antisocial acts and individuals are often labelled as disgusting [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
], similar physiological and brain activation has been observed in moral and biological disgust [<xref ref-type="bibr" rid="RSTB20110165C9">9</xref>
,<xref ref-type="bibr" rid="RSTB20110165C116">116</xref>
] and a number of studies have suggested that physiological disgust can affect moral judgement [<xref ref-type="bibr" rid="RSTB20110165C117">117</xref>
–<xref ref-type="bibr" rid="RSTB20110165C119">119</xref>
], though doubt has been cast on some of these findings [<xref ref-type="bibr" rid="RSTB20110165C120">120</xref>
]. While the link between disgust and morality needs further exploration, disgust clearly plays a major and visceral role in our response to wrongdoing, exploitation and injustice. We asked teenagers at one UK school to list what they found to be morally disgusting; of several hundred examples the most common were rape, racism, killing, murder, torture, bullying, paedophilia, discrimination, necrophilia, genocide, exploitation, incest, theft, bestiality and cannibalism. Several authors have made a start on unpicking the nature of the relationship [<xref ref-type="bibr" rid="RSTB20110165C1">1</xref>
,<xref ref-type="bibr" rid="RSTB20110165C6">6</xref>
,<xref ref-type="bibr" rid="RSTB20110165C121">121</xref>
]—is it an exaptation of an ancient system designed to distance ourselves from parasites, turned to the function of ostracizing social parasites? Is it purely metaphorical? Or is disgust elicited because many of these offences involve bodily fluids? Whatever the explanation, there is no doubt that the emotion of disgust plays a major role in our decision-making about what is right and wrong. Nussbaum, for example, describes how the rhetoric of disgust influences judgement in the legal system. She argues that we should distrust our disgust responses, because they can lead to prejudice and discrimination [<xref ref-type="bibr" rid="RSTB20110165C122">122</xref>
]. While this may indeed be the case, Nussbaum fails to acknowledge that disgust also plays a major part in our ability to distinguish right and wrong—an ability which underpins our ability to function in ultrasocial groups. To outlaw disgust in moral judgement would be akin to throwing the baby out with the bathwater. As Leon Kass [<xref ref-type="bibr" rid="RSTB20110165C123">123</xref>
] has argued, there is ‘wisdom in repugnance’. Moral disgust is one of the major positive forces that builds, maintains and polices the cooperative societies in which we have to live to thrive. Understanding disgust's part in the morality puzzle remains a major task for social scientists—one that could offer important cues for the ways in which we make social policy.</p>

</sec>

<sec id="s6" sec-type="conclusions"><label>6.</label>
<title>Conclusions</title>

<p>Disgust is a powerful emotion that plays an under-appreciated part in all of our lives, not just in our everyday hygiene habits and in our manners, but in our response to disease, to social hierarchy, to those who are different from ourselves and to immorality. Disgust is a double-edged sword that is both the first line of defence against disease, but also a cause of much human suffering. Throughout this paper, I have argued that it is vital that we shine a spotlight into this less-explored darker recess of our psychology. Doing so allows us to enhance our abilities at disease prevention, to deal with many of our commonest anxieties and phobias better and to combat the many prejudices that plague human social relations. It may even help us to understand how to build more cooperative societies.</p>

<p>Understanding disgust matters, both in itself, and for the practical consequences that stem from understanding. Understanding the function of the brain is possibly the most important intellectual challenge faced by scientists today. Emotions remain a contested subject in psychology with little agreement as to what they are, how they should be characterized, how they should be studied, even as to how many there are [<xref ref-type="bibr" rid="RSTB20110165C124">124</xref>
–<xref ref-type="bibr" rid="RSTB20110165C126">126</xref>
]. If disgust is an example of an emotion, then the new synthesis suggests that other emotions should have similar features. They should all have an adaptive purpose, an ancestral animal history, a set of cues that engage emotive processes and a set of typical behaviours, which may or may not be adaptive in the current environment [<xref ref-type="bibr" rid="RSTB20110165C124">124</xref>
]. Though they may have associated feelings, this is not definitive of an emotion. Disgust provides a rich test bed and a prototype for emotion studies.</p>

<p>On the practical side, we have seen that understanding disgust has many benefits. Understanding disgust as a disease-avoidance mechanism can help us to change the behaviours that cause infection and chronic disease. Understanding how disgust tends to err on the ‘safe side’ helps to explain why exclusion of the sick, the old, the lower caste and the different is still so common and shows us that social movements can refuse such prejudice—even labelling it disgusting—as witnessed by the fact that the kids of today now find racism and homophobia disgusting. Understanding how individuals exploit disgust's ability to contaminate and spoil in their own quest for power can help us to expose such strategies.</p>

<p>If understanding is the key to action, then yet more understanding is needed. The new synthesis that disgust is an adaptive system for infectious disease control has yet to be fully taken on board in the brain and behavioural sciences. Evolutionary theory offers a new means of integration of studies of brain architecture, neurochemistry and pathology, and of individual, social and cultural behaviour. The theory base for such work is vital—it provides both conceptual unity for prediction and a means for interpreting results. Theory should also inform the tools of such work—if psychological constructs are incorrectly conceived of, then the tools that are used to try to measure them will fail, giving false or misleading results. A key priority is the development of better measures of disgust. An early task for such tools is to use them to explore the relationship between subtypes of disgust and pathological phobias and anxieties.</p>

<p>Further work is needed to elucidate the developmental pathways of disgust and to explore how predispositions interact with social norms to create manners, the first line of defence against interpersonal infection and a possible evolutionary precursor of morality. The origins of the human ability to live in ultrasocial groups is one of the hottest topics in evolutionary biology today [<xref ref-type="bibr" rid="RSTB20110165C127">127</xref>
–<xref ref-type="bibr" rid="RSTB20110165C129">129</xref>
]. Disgust provides a key thread that may help us to unravel this problem.</p>

<p>Disgust studies, however, face the same problem of repulsion that they confront. Olatunji searched the published literature and found 10–20 times more papers per year on anger and fear than on disgust [<xref ref-type="bibr" rid="RSTB20110165C67">67</xref>
], perhaps owing to its lack of attractiveness when compared with other emotions. A similar problem afflicts public health. Though diarrhoeal diseases are the number two killer of children in the world today, they still attract only a fraction of the research funds that go to malaria or HIV, for example [<xref ref-type="bibr" rid="RSTB20110165C16">16</xref>
,<xref ref-type="bibr" rid="RSTB20110165C130">130</xref>
]. Lack of sanitation and hygiene are among the biggest culprits, yet it is hard to attract students to carry out studies of the faecal–oral transmission of infection, or on how to meet 40 per cent of the planet's urgent need for sanitation. A recent review found that menstrual hygiene had been comprehensively ignored in health research. Our group is devoting efforts to finding ways of making sanitation sexy, setting-up events such as the ‘Golden Poo Awards’ for example. Artistic exploration of the disgusting such as the Wellcome Trust's season on ‘Dirt’ and the ‘Grossology’ exhibitions that tour the world, help to attract interest and expose disgust to the light of day. Such efforts are beginning to pay off in terms of increased research funding.</p>

<p>Disgust is a voice in our heads, it is the voice of our ancestors telling us to avoid infectious disease and social parasites. The voice of emotion is there for a reason, it guides us to behave in ways that are good for our genes, or more precisely, to behave in ways that were good for the genes of our ancestors. But we no longer live in the environments in which we evolved, and emotion is not the only voice in our heads. We have also evolved an executive brain which can listen to reasoned argument, weigh outcomes, learn from experience in new environments, and from science, and which can override emotional responses when the long-term benefits may outweigh the short-term gain [<xref ref-type="bibr" rid="RSTB20110165C124">124</xref>
]. Disgust is a vital force in our lives, we need to listen to it, to act on it and sometimes we need to over-ride it. Above all we need to understand it.</p>

</sec>

</body>

<back>

<ack><title>Acknowledgements</title>

<p>Thanks to Mícheál de Barra and Robert Aunger for comments on a first draft of this paper and to Josh Tybur and Dick Stevenson for comments on the second draft.</p>

</ack>

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<mods version="3.6"><titleInfo><title>Why disgust matters</title>
</titleInfo>
<titleInfo type="alternative" contentType="CDATA"><title>Why disgust matters</title>
</titleInfo>
<name type="personal"><namePart type="given">Valerie</namePart>
<namePart type="family">Curtis</namePart>
<affiliation>Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK</affiliation>
<affiliation>E-mail: val.curtis@lshtm.ac.uk</affiliation>
<role><roleTerm type="text">author</roleTerm>
</role>
<description>One contribution of 11 to a Theme Issue ‘Disease avoidance: from animals to culture’.</description>
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<originInfo><publisher>The Royal Society</publisher>
<dateIssued encoding="w3cdtf">2011-12-12</dateIssued>
<copyrightDate encoding="w3cdtf">2011</copyrightDate>
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<language><languageTerm type="code" authority="iso639-2b">eng</languageTerm>
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<abstract>The new synthesis about disgust is that it is a system that evolved to motivate infectious disease avoidance. There are vital practical and intellectual reasons why we need to understand disgust better. Practically, disgust can be harnessed to combat the behavioural causes of infectious and chronic disease such as diarrhoeal disease, pandemic flu and smoking. Disgust is also a source of much human suffering; it plays an underappreciated role in anxieties and phobias such as obsessive compulsive disorder, social phobia and post-traumatic stress syndromes; it is a hidden cost of many occupations such as caring for the sick and dealing with wastes, and self-directed disgust afflicts the lives of many, such as the obese and fistula patients. Disgust is used and abused in society, being both a force for social cohesion and a cause of prejudice and stigmatization of out-groups. This paper argues that a better understanding of disgust, using the new synthesis, offers practical lessons that can enhance human flourishing. Disgust also provides a model system for the study of emotion, one of the most important issues facing the brain and behavioural sciences today.</abstract>
<note type="footnotes">One contribution of 11 to a Theme Issue ‘Disease avoidance: from animals to culture’.</note>
<subject><topic>disgust</topic>
<topic>obsessive compulsive disorder</topic>
<topic>disease</topic>
<topic>behaviour</topic>
<topic>evolution</topic>
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<topic>1001</topic>
<topic>87</topic>
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<topic>14</topic>
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<subject><genre>leader</genre>
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<identifier type="ISSN">0962-8436</identifier>
<identifier type="eISSN">1471-2970</identifier>
<identifier type="PublisherID">RSTB</identifier>
<identifier type="PublisherID-hwp">royptb</identifier>
<part><date>2011</date>
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Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Sante/explor/SrasV1/Data/Istex/Corpus

HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 001D49 | SxmlIndent | more

HfdSelect -h $EXPLOR_AREA/Data/Istex/Corpus/biblio.hfd -nk 001D49 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Sante
   |area=    SrasV1
   |flux=    Istex
   |étape=   Corpus
   |type=    RBID
   |clé=     ISTEX:A9D8D3F534B0B665A9D63170503EA88FF56064BA
   |texte=   Why disgust matters
}}

This area was generated with Dilib version V0.6.33.
Data generation: Tue Apr 28 14:49:16 2020. Site generation: Sat Mar 27 22:06:49 2021

	Serveur d'exploration SRAS
	Attention, ce site est en cours de développement ! Attention, site généré par des moyens informatiques à partir de corpus bruts. Les informations ne sont donc pas validées.

Serveur d'exploration SRAS

Why disgust matters

Why disgust matters

Source :

Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri