Prev Chronic DisPrev Chronic DisPCDPreventing Chronic Disease1545-1151Centers for Disease Control and Prevention24355105386952913_019810.5888/pcd10.130198Original ResearchPeer ReviewedOverweight, Obesity, and Perception of Body Image Among Slum Residents in Nairobi, Kenya, 2008–2009EttarhRemarePhDVan de VijverStevenMDMScOtiSamMBBSMScKyobutungiCatherinePhDMBChBAuthor Affiliations: Steven Van de Vijver, Sam Oti, Catherine Kyobutungi, African Population and Health Research Center, Nairobi, Kenya.Corresponding Author: Remare Ettarh, PhD, Faculty of Medicine, University of British Columbia, 2775 Laurel St, Vancouver, British Columbia, Canada V5Z 1M9. Telephone: 604-352-5117 E-mail: remare.ettarh@ubc.ca.20131912201310E212Introduction

The increase in cardiovascular diseases in sub-Saharan Africa has been attributed in part to the changes in lifestyle, and the prevalence of risk factors for cardiovascular disease is higher among urban populations than among nonurban populations. The objective of this study was to determine the prevalence of overweight and obesity and examine perceptions of body size differentiated by sex and other determinants among slum dwellers in Nairobi, Kenya.

Methods

Analysis included 4,934 adults randomly selected from the Korogocho and Viwandani slums of Nairobi. Height and weight were measured during interviews; body mass index (BMI) was calculated. Perceptions of current and ideal body image were determined by using 18 silhouette drawings of body sizes ranging from very thin to very obese. We used multivariate logistic regression analysis to determine predictors of underestimation of body weight among overweight and obese respondents.

Results

Overall, 43.4% of women and 17.3% of men in the study population were overweight or obese. More than half (53%) of those who were overweight or obese underestimated their weight; 34.6% of women and 16.9% of men did so. In all BMI categories, more than one-third of women and men preferred body sizes classified as overweight or obese.

Conclusion

This study highlights the prevalence of overweight and obesity and the strong preference for larger body size among adults in the slums of Nairobi. Interventions to educate residents on the health risks associated with excess body weight are necessary as a part of strategies to reduce the prevalence of risk factors for cardiovascular disease in these settlements.

Introduction

Cardiovascular disease has become the leading cause of death in sub-Saharan Africa (1). Increasing urbanization and associated lifestyle changes may induce risk factors, such as obesity, for cardiovascular disease (2,3). In sub-Saharan Africa, the rise in the prevalence of obesity in urban areas has coincided with the growth of an increasingly educated and wealthier middle class that engages in less physical activity and consumes greater amounts of calorie-dense foods than the poorer segments of the population (3,4). However, the change in lifestyle in urban sub-Saharan Africa also profoundly affects the urban poor, and the prevalence of risk factors for cardiovascular disease is high in resource-deprived city slums (4,5). Although studies show that obesity is increasing among the urban poor (4), data are limited on the extent of the problem among city slum populations in different countries in sub-Saharan Africa.

Cultural ideals influence how people assess their body image and body weight (6,7). Studies in sub-Saharan Africa suggest that the poor tend to perceive body size and its health implications differently from people in the same cities with greater wealth and education (8). In some societies in sub-Saharan Africa, a larger body size is commonly assumed to reflect good health and higher social status and may thus be considered desirable (8,9). In addition to examining culturally desired body sizes among the poor in sub-Saharan Africa, it is also relevant to learn how people perceive their own body size and weight, because underestimation of body mass index (BMI) is prevalent in low-income settings (10) and may predict overweight or obesity (11). Although some of the factors that influence perception of body image have been studied in developed countries, this topic remains largely unexplored in sub-Saharan Africa. Body image perceptions and preferences differ by sex in the United States (12,13), but the effects of age and marital status are unclear (14,15). The objective of this study was to determine the prevalence of overweight and obesity and examine perceptions of body size differentiated by sex and other determinants among slum dwellers in Nairobi, Kenya.

MethodsStudy participants and design

The study was part of a cross-sectional survey designed to assess the linkages between socioeconomic and sociocultural factors, perceived personal risk for cardiovascular disease, and health behavior in the Korogocho and Viwandani slums of Nairobi. The survey was conducted from May 2008 through April 2009 as part of the Nairobi Urban and Health Demographic Surveillance System (NUHDSS), which is run by the African Population and Health Research Center. The 2 slums are typical of the informal settlements in Nairobi, although they differ in terms of community and population stability. Korogocho is populated by more settled residents, many of whom have lived there for many years. Viwandani, on the other hand, has a more a youthful and transient population that is drawn to the location by job opportunities in the nearby industrial area. However, the levels of poverty are high in both slums, and incomes are lower than those in non-slum areas of the city (16). Characteristics of the 2 slums and details of the NUHDSS and its operations are available elsewhere (16).

A total of 5,190 residents of the 2 slums were randomly selected and stratified by sex and age using a sampling frame that included all adults aged 18 years or older in the NUHDSS. Overall response rates were 94% in Korogocho and 95% in Viwandani. All interviews and measurements were conducted by trained field workers using a structured questionnaire translated into Kiswahili. The purpose of the study was explained to each respondent and signed consent obtained before the interview was conducted and anthropometric measurements taken. The study protocol was approved by the Kenya Medical Research Institute/National Ethical Review Committee (NON-SSC Protocol No.339).

Study variables

The participants were administered a questionnaire that included sections on sociodemographic characteristics. Age of respondents was obtained as a continuous variable in years and categorized into age groups. Sex, marital status, and educational attainment were reported by each respondent, while socioeconomic status was determined as an index based on ownership of household assets and categorized into quintiles (16). The weight of each respondent was measured to the nearest 0.1 kg and height to the nearest centimeter using a SECA electronic digital weighing scale and a SECA portable stadiometer (Seca GmbH, Hamburg, Germany). The reliability of all measurements between field workers was assessed during training and piloting of the questionnaire. BMI was calculated as body weight in kilograms divided by the square of the height in meters (17). BMI was categorized according to World Health Organization classifications (17): underweight (BMI <18.5), normal (BMI = 18.6–24.9), overweight (BMI = 25.0–29.9), and obese (BMI ≥30.0).

Body image was assessed by using methods developed for studies of body image and eating disorders (18). The body image rating scale included 18 silhouettes of each sex, ranging from very thin to very obese (Figure 1). This validated scale is widely used, and body images correlate strongly with objective measures of body size (19,20). Each figure was displayed on cards 16 cm in height, and the randomly numbered cards were displayed to participants in a random order. To determine the current body image, participants were asked, “Which image most accurately depicts your current body size?” To determine ideal body size, the participant was asked, “Which image most accurately depicts the body size you would wish to have?” The 18 images were divided into 4 categories by adapting the image scheme described by Madrigal et al (11).

Body image rating scale for men and women. Images 1 through 5 represent people who are underweight, images 6 through 9 represent people of normal weight, images 10 through 13 represent overweight people, and images 14 through18 represent obese people (11).

This image-rating scale presents the silhouettes of 18 women and 18 men, arranged in order of increasing body size, from underweight (very thin) to overweight (very obese).
Data analysis

Descriptive analysis of BMI, current body image, and ideal body image by sex was conducted by using proportions. The proportion of respondents underestimating their weight in each BMI category was calculated for both sexes. The extent of overestimation of, agreement with, or underestimation of actual body size was determined by comparing the BMI category with the current body image category. To determine predictors of underestimation of BMI among overweight or obese participants, a multivariate logistic regression model was fit using sociodemographic variables that were significant (at P < .25) in the univariate logistic analysis. The dependent variable was a binary outcome of whether or not the participant underestimated his or her BMI category (underestimation = 1; agreement or overestimation = 0). The independent variables in the model were age, sex, marital status, and education. The bivariate relationship between BMI and ideal body image was determined. All statistical analyses were done by using Stata version 11 (Stata Corp, College Station, Texas).

Results

Of the 5,190 people recruited into the main study, 4,934 people (comprising 2,669 [54%] men and 2,265 [46%] women) had the data for the required variables and were included in the analysis. The mean age of the respondents was 42 years: 45% of respondents were younger than 40 years, and 55% were aged 40 years or older. The proportion of the respondents who had primary education or less was 75%, and approximately 2.5% had postsecondary education.

Overall, 43.4% of women and 17.3% of men in the study population were overweight or obese (Table 1). Obesity was more prevalent among women (15.5%) than among men (2.3%). Approximately half (50.5%) of women rated their current body image as normal weight; although 14.2% rated their current body image as underweight, only 5.1% were underweight according to BMI. Among men, 52.7% rated their current body image as normal weight; according to BMI, 72.9% were normal weight. The proportions of men who perceived themselves to be overweight (20.8%) or obese (13.4%) were greater than the proportions who were overweight or obese according to BMI (15.0% and 2.3%, respectively). Among women, the distribution of categories for ideal body image was not substantially different from the distribution of categories for BMI. For example, 14.8% of women chose an obese image as ideal, and 15.5% of women were obese. These distributions, however, were different among men: 20.6% of men chose an obese image as ideal, whereas only 2.3% of men were obese according to BMI.

Distribution by Weight Category According to Body Mass Index, Current Body Image, and Ideal Body Image in Women and Men, Nairobi, Kenya, 2008–2009<xref rid="T1FN1" ref-type="table-fn">a</xref>
CategoryWomen (n = 2,265)
Men (n = 2,669)
Body Mass IndexCurrent Body ImageIdeal Body ImageBody Mass IndexCurrent Body ImageIdeal Body Image
Underweight115 (5.1)321 (14.2)160 (7.1)262 (9.8)352 (13.2)162 (6.1)
Normal weight1,167 (51.5)1,143 (50.5)1,209 (53.4)1,946 (72.9)1,406 (52.7)1,104 (41.3)
Overweight631 (27.9)503 (22.2)562 (24.8)401 (15.0)554 (20.8)854 (32.0)
Obese352 (15.5)298 (13.2)334 (14.8)60 (2.3)357 (13.4)549 (20.6)

All values are no. (%). All percentages are based on column totals. Percentages may not add up to 100 because of rounding.

In all BMI categories, more than one-third of women preferred body images classified as overweight or obese, and the proportion of men with a preference for overweight or obese body images was greater than that of women (Figure 2). More than half of women and men classified as overweight or obese indicated a preference for overweight or obesity.

Ideal body image, by current body mass index (BMI) and sex. Survey participants were asked to indicate the body size they wished to have.

WomenMen
Ideal body imageNo. (%)Ideal body imageNo. (%)
Underweight (n = 115) Underweight (n = 262)
Underweight17 (15)Underweight20 (8)
Normal weight55 (48)Normal weight112 (43)
Overweight31 (27)Overweight84 (32)
Obese12 (10)Obese46 (18)
Normal Weight (n = 1,167) Normal Weight (1,946)
Underweight93 (8)Underweight129 (7)
Normal weight660 (57)Normal weight828 (43)
Overweight256 (22)Overweight602 (31)
Obese158 (14)Obese387 (20)
Overweight (n = 631) Overweight (n = 401)
Underweight34 (5)Underweight11 (3)
Normal weight347 (55)Normal weight145 (36)
Overweight157 (25)Overweight143 (36)
Obese93 (15)Obese102 (25)
Obese (n = 352) Obese (n = 60)
Underweight16 (5)Underweight2 (3)
Normal weight147 (42)Normal weight19 (32)
Overweight118 (34)Overweight25 (42)
Obese71 (20)Obese14 (23)

Among women, 18.2% overestimated their BMI; 33.0% of men overestimated their BMI (Table 2).Underestimation was more prevalent among women (34.6%) than among men (16.9%). Obese women accounted for 28.8% of total underestimation among women, whereas obese men accounted for only 7.8% of total underestimation among men.

Proportion of Women and Men and Their Overestimation of, Agreement With, or Underestimation of Body Mass Index, by Weight Category, Nairobi, Kenya, 2008–2009<xref rid="T2FN1" ref-type="table-fn">a</xref>
CategoryOverestimation
Agreement
Underestimation
WomenMenWomenMenWomenMen
Underweight60 (14.6)195 (22.1)55 (5.1)67 (5.0)
Normal257 (62.4)588 (66.7)705 (65.9)1,105 (82.6)205 (26.1)253 (56.2)
Overweight95 (23.1)98 (11.1)183 (17.1)141 (10.5)353 (45.0)162 (36.0)
Obese126 (11.8)25 (1.9)226 (28.8)35 (7.8)
Totalb 412 (18.2) 881 (33.0) 1,069 (47.2) 1,338 (50.1) 784 (34.6) 450 (16.9)

All values are no. (%). Percentages in the table may not add up to 100 because of rounding.

Percentages for only this row are based on total counts for each sex.

Of 1,444 participants classified as overweight or obese, 776 underestimated their BMI. Of the key sociodemographic characteristics of the participants, sex was a significant predictor of underestimation of BMI among normal-weight participants, whereas age and sex were significant predictors among overweight or obese participants (Table 3). Overweight or obese participants aged 50 years or older were less likely than their younger counterparts to underestimate their BMI. Similarly, men were less likely than women to underestimate their BMI in both age categories. Marital status and education were not significantly associated with the likelihood of BMI underestimation.

Sociodemographic Predictors of Body Mass Index Underestimation Among Normal-Weight and Overweight or Obese Survey Respondents, Nairobi, Kenya, 2008–2009
CharacteristicNormal Weight
Overweight or Obese
No. of Respondents% Who Under-estimated BMIOR (95% CI)No. of Respondents% Who Under-estimated BMIOR (95% CI)
Age, y
18–2981915.51 [Reference]20264.91 [Reference]
30–3970515.91.09 (0.80–1.49)31860.40.90 (0.61–1.33)
40–4967613.00.87 (0.62–1.23)39856.80.80 (0.55–1.18)
50–5955113.80.84 (0.57–1.24)30947.90.53a (0.35–0.80)
≥6036215.21.10 (0.68–1.77)21736.40.38a (0.23–0.63)
Sex
Female1,16717.61 [Reference]98358.91 [Reference]
Male1,94613.00.71a (0.56–0.89)46142.70.50a (0.38–0.65)
Marital status
Married/cohabiting2,20313.51 [Reference]98453.51 [Reference]
Never married48817.81.24 (0.90–1.71)14262.71.17 (0.78–1.78)
Ever married42217.21.21 (0.85–1.72)31850.60.85 (0.61–1.18)
Education
Less than primary68117.31 [Reference]39355.71 [Reference]
Primary1,37314.30.77 (0.59–1.01)55456.70.89 (0.67–1.17)
Secondary61912.90.74 (0.52–1.03)27454.00.78 (0.55–1.10)
College/university7215.30.88 (0.44–1.76)2958.60.97 (0.43–2.17)
SES quintilesb
Lowest (poorest)67814.924850.0
Second48415.918851.6
Middle55114.717456.9
Fourth67316.333352.5
Highest (least poor)63512.046456.6

Abbreviations: BMI, body mass index; OR, odds ratio; CI, confidence interval; SES, socioeconomic status.

P < .001 from multivariate logistic regression.

Socioeconomic status was excluded from the model because of lack of significance in the univariate logistic regression analysis.

Discussion

Our study was designed to investigate the prevalence of overweight and obesity, the extent of disagreement between perceived body image and BMI, and the patterns of preferred body size in 2 slums in Nairobi. The prevalence of overweight or obesity among women in these urban slums was similar to the prevalence reported in a national survey of urban women in Kenya (4), and the sex pattern shown in our study confirms the patterns reported in other studies in Africa (21,22). In the context of poverty and resource deprivation in slums, overweight and obesity are a challenge and help to drive the increasing rates of morbidity associated with cardiovascular disease in these urban settlements (2325).

A major issue associated with overweight and obesity is the perception of body size in different cultural settings (26,27). Our study used body images or silhouettes to estimate self-reported body size. Differences between objective measures of body size (ie, BMI) and individual perception of current body image suggest individual or societal definitions of desirable or “normal” body size that are not based on medical facts. Our study found that more than half of the population who were overweight or obese underestimated their weight, suggesting that most of these people do not acknowledge their extra weight and the related health risks.

We also determined the ideal body image for each survey participant and how it related to their actual BMI category. Regardless of BMI category, substantial proportions of women and men indicated a desire to have a body size that was larger than their actual size. More than half of the participants who were overweight or obese chose an ideal body image that was either overweight or obese. Families, communities, and society strongly influence perceptions of body image, and excess body weight has generally been associated with wealth and health and considered a desirable attribute in many parts of sub-Saharan Africa (6,8,22). The implications of excess body weight as a risk factor for noncommunicable diseases are not readily apparent to most residents of poor settlements because of low levels of education and the lack of emphasis on noncommunicable diseases in traditional health education and counseling at the community level in sub-Saharan Africa.

In our focus on overweight and obese participants, we sought to identify sociodemographic characteristics associated with underestimation of BMI. More than half (54%) of this subgroup underestimated their BMI, and age and sex were the only significant predictors of underestimation. These results are consistent with reports of greater dissatisfaction with body image among younger adults and women (28). Although studies have found that education and income are associated with the likelihood of obesity in urban sub-Saharan Africa (4), we could not find reports on the determinants of underestimation of BMI in this high-risk subgroup.

This study has several limitations. One is the use of a discrete number of silhouettes to assess body image. By using this method, body size is considered a continuous variable measured from a finite number of images (29). The amount of information lost by using this method can be reduced by increasing the precision of the instrument. In our study, we attempted to reduce the coarseness of the scale by using an 18-silhouette scale developed and validated in a previous study (30). Other limitations of the study include the challenge of establishing the influence of cultural preferences and beliefs on body image in slum settlements comprising diverse ethnic groups and the extent to which these 2 slums are representative of other slums in Nairobi. A strength of the study is the participation of a large number of residents of an informal urban settlement in Kenya. Although a large proportion of the urban population in sub-Saharan Africa lives in slums, data are limited on the increasingly relevant topic of obesity and weight-related perceptions among this growing group.

Our study has important implications for the effort to reduce the prevalence of risk factors for cardiovascular disease in poor urban settings in Kenya and the rest of sub-Saharan Africa. As the epidemiological transition continues among low- and middle-income countries, the prevalence of obesity also increases, even among low-income groups. The high levels of overweight and obesity reported in our study — despite the high levels of poverty found in the slums we studied — suggest that effective dietary and lifestyle interventions are needed to address this issue in slums. Innovative strategies to ensure better appreciation and understanding of the health consequences of overweight and obesity by slum residents are required if efforts to reverse the greater preference for larger body size are to be successful.

Acknowledgments

At the time this study was conducted, Dr Ettarh was affiliated with African Population and Health Research Center, Nairobi, Kenya. The study was part of a larger research project supported by a grant from the Wellcome Trust UK (grant no. WT092775MA). We also acknowledge the participants and members of the research team who conducted the study.

The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions.

Suggested citation for this article: Ettarh R, Van de Vijver S, Oti S, Kyobutungi C. Overweight, Obesity, and Perception of Body Image Among Slum Residents in Nairobi, Kenya, 2008–2009. Prev Chronic Dis 2013;10:130198. DOI: http://dx.doi.org/10.5888/pcd10.130198.

ReferencesGlobal burden of disease [database on the Internet]. WHO Press; 2008 http://www.who.int/healthinfo/global_burden_disease/ Accessed March 15, 2012 Vorster HH . The emergence of cardiovascular disease during urbanisation of Africans.Public Health Nutr2002;5(1A):23943 10.1079/PHN200129912027290 Sodjinou R , Agueh V , Fayomi B , Delisle H . Obesity and cardio-metabolic risk factors in urban adults of Benin: relationship with socio-economic status, urbanisation, and lifestyle patterns.BMC Public Health2008;8:84 10.1186/1471-2458-8-8418318907 Ziraba AK , Fotso JC , Ochako R . Overweight and obesity in urban Africa: a problem of the rich or the poor?BMC Public Health2009;9:465 10.1186/1471-2458-9-46520003478 van de Vijver SJ , Oti SO , Agyemang C , Gomez GB , Kyobutungi C . Prevalence, awareness, treatment and control of hypertension among slum dwellers in Nairobi, Kenya.J Hypertens2013;31(5):101824 10.1097/HJH.0b013e32835e3a5623425703 Duda RB , Jumah NA , Hill AG , Seffah J , Biritwum R . Assessment of the ideal body image of women in Accra, Ghana.Trop Doct2007;37(4):2414 10.1258/00494750778233288317988495 Swami V , Frederick DA , Aavik T , Alcalay L , Allik J , Anderson D , The attractive female body weight and female body dissatisfaction in 26 countries across 10 world regions: results of the International Body Project I.Pers Soc Psychol Bull2010;36(3):30925 10.1177/014616720935970220179313 Holdsworth M , Gartner A , Landais E , Maire B , Delpeuch F . Perceptions of healthy and desirable body size in urban Senegalese women.Int J Obes Relat Metab Disord2004;28(12):15618 10.1038/sj.ijo.080273915278107 Puoane T , Tsolekile L , Steyn N . Perceptions about body image and sizes among black African girls living in Cape Town.Ethn Dis2010;20(1):293420178179 Loret de Mola C , Pillay TD , Diez-Canseco F , Gilman RH , Smeeth L , Miranda JJ . Body mass index and self-perception of overweight and obesity in rural, urban and rural-to-urban migrants: Peru migrant study.PLoS ONE2012;7(11):e50252 10.1371/journal.pone.005025223209688 Madrigal H , Sanchez-Villegas A , Martinez-Gonzalez MA , Kearney J , Gibney MJ , Irala J , Underestimation of body mass index through perceived body image as compared to self-reported body mass index in the European Union.Public Health2000;114(6):4687311114759 Cash TF , Henry PE . Women’s body images: the results of a national survey in the USA.Sex Roles1995;33(1-2):1928 10.1007/BF01547933 Demarest J , Langer E . Perception of body shape by underweight average, and overweight men and women.Percept Mot Skills1996;83(2):56970 10.2466/pms.1996.83.2.5698902032 Demarest J , Allen R . Body image: gender, ethnic, and age differences.J Soc Psychol2000;140(4):46572 10.1080/0022454000960048510981375 Friedman MA , Dixon AE , Brownell KD , Whisman MA , Wilfley DE . Marital status, marital satisfaction, and body image dissatisfaction.Int J Eat Disord1999;26(1):815 10.1002/(SICI)1098-108X(199907)26:1<81::AID-EAT10>3.0.CO;2-V10349587 Emina J , Beguy D , Zulu EM , Ezeh AC , Muindi K , Elung’ata P , Monitoring of health and demographic outcomes in poor urban settlements: evidence from the Nairobi Urban Health and Demographic Surveillance System.J Urban Health2011;88(Suppl 2):S20018 10.1007/s11524-011-9594-121713553World Health Organization Physical status: the use and interpretation of anthropometry. Report of a WHO Expert Committee. WHO Technical Report Series 854; 1995 Williamson DA , Davis CJ , Bennett SM , Goreczny AJ , Gleaves DH . Development of a simple procedure for assessing body image disturbances.Behav Assess1989;11(4):43346 Bulik CM , Wade TD , Heath AC , Martin NG , Stunkard AJ , Eaves LJ . Relating body mass index to figural stimuli: population-based normative data for Caucasians.Int J Obes Relat Metab Disord2001;25(10):151724 10.1038/sj.ijo.080174211673775 Stunkard AJ , Sorensen TI , Hanis C , Teasdale TW , Chakraborty R , Schull WJ , An adoption study of human obesity.N Engl J Med1986;314(4):1938 10.1056/NEJM1986012331404013941707 Jumah NA , Duda RB . Comparison of the perception of ideal body images of Ghanaian men and women.Afr J Health Sci2007;14(1-2):5460 Adeboye B , Bermano G , Rolland C . Obesity and its health impact in Africa: a systematic review.Cardiovasc J Afr2012;23(9):51221 10.5830/CVJA-2012-04023108519 Akatsu H , Aslam A . Prevalence of hypertension and obesity among women over age 25 in a low income area in Karachi, Pakistan.J Pak Med Assoc1996;46(9):19138936982 Bunnag SC , Sitthi-Amorn C , Chandraprasert S . The prevalence of obesity, risk factors and associated diseases in Klong Toey slum and Klong Toey government apartment houses.Diabetes Res Clin Pract1990;10(Suppl 1):S817 10.1016/0168-8227(90)90145-J2286156 Sawaya AL , Dallal G , Solymos G , de Sousa MH , Ventura ML , Roberts SB , Obesity and malnutrition in a Shantytown population in the city of Sao Paulo, Brazil.Obes Res1995;3(Suppl 2):107s15s 10.1002/j.1550-8528.1995.tb00453.x8581766 George JB , Franko DL . Cultural issues in eating pathology and body image among children and adolescents.J Pediatr Psychol2010;35(3):23142 10.1093/jpepsy/jsp06419703916 Wardle J , Haase AM , Steptoe A . Body image and weight control in young adults: international comparisons in university students from 22 countries.Int J Obes (Lond)2006;30(4):64451 10.1038/sj.ijo.080305016151414 Cachelin FM , Rebeck RM , Chung GH , Pelayo E . Does ethnicity influence body-size preference? a comparison of body image and body size.Obes Res2002;10(3):15866 10.1038/oby.2002.2511886938 Gardner RM , Friedman BN , Jackson NA . Methodological concerns when using silhouettes to measure body image.Percept Mot Skills1998;86(2):38795 10.2466/pms.1998.86.2.3879638738 Williamson DA , Womble LG , Zucker NL , Reas DL , White MA , Blouin DC , Body image assessment for obesity (BIA-O): development of a new procedure.Int J Obes Relat Metab Disord2000;24(10):132632 10.1038/sj.ijo.080136311093295