INTRODUCTION

The World Health Organization (WHO) has affirmed that obesity is the global pandemic of the 21st century (i.e., globesity) and a first-order health problem because of its high prevalence. According to current figures from the WHO and the International Association for the Study of Obesity (IASO), one in two adults is overweight (35-40%) or obese (15-20%). Alarmingly, obesity prevalence has experienced a growing exponential trend in all world nations in recent decades (International Union of Nutritional Sciences, IUNS, 2015). Achieving a Body Mass Index (BMI) greater than 25 kg/m2 is becoming easier and faster given current lifestyles (WHO, 2017). In Spain, 17% of adults are obese and an additional 36% are overweight, according to data from the latest editions of the National Health Survey and the European Health Survey (see also higher prevalence rates in ^{Valdés et al., 2014}).

Obesity significantly decreases the health status and quality of life of those who suffer from it and seriously threatens their life expectancy, as it is associated with an increased risk of premature death from any cause, but particularly due to cardiovascular events and cancer (^{Di Angelantonio et al., 2016}). The higher the BMI, the higher is the risk of mortality, up to almost three times higher. Obesity also has important influences on an individual's emotional, cognitive, motivational and behavioral functioning, impairing their well-being, quality of life, interaction with others and personal fulfillment (^{Scott et al., 2008}).

Body image in obesity has been widely researched (e.g., ^{Latner & Wilson, 2011}). In this paper, we draw attention to a subgroup of individuals with excess weight departing from the majority of obese people, who tend to have negative body perceptions and low body satisfaction. This is a condition that is hardly reflected in scientific reports and has not being named so far, and its characteristics and manifestations are very little known. We call it «Oberexia» (from ob - "over" + orexis - "appetite, desire"). In our proposed conceptualization of Oberexia, this condition is characterized by: 1) a distortion of body perceptions: oberexics have a misperception of their actual weight as normal or even low, i.e., although overweight or obese, they do not perceive themselves as such, but rather as thin, beautiful, strong and healthy. Their body satisfaction is consequently high, and therefore, they would not want to change their body appearance. In fact, in cases of dissatisfaction, the ideal for them would be a body with greater weight and volume, but importantly, only in terms of fat mass, not muscle mass; 2) an alteration in eating behavior: oberexics would engage in eating habits based on hyperphagia and the intake of unhealthy, hypercaloric foods in order to maintain their weight or get the body they want, i.e., one of a greater volume and weight than their current one; and 3) other concomitant weight and body control behaviors, such as a sedentary lifestyle or an almost total inactivity, which contribute to the achievement of the mentioned objective. Figure 1 shows these characteristics graphically. In short, Oberexia is manifested through the ignorance or denial of being overweight and of obesity as a risk factor for disease, distorted positive body perceptions, a desire to have a heavy (heavier) and (more) voluminous body in terms of fat mass, and weight-control behaviors aimed at maintaining or increasing weight and improving body satisfaction.

Figure 1 Features of Oberexia. 

Our proposal for stating the existence of Oberexia is based on interesting previously published empirical findings about body perceptions and derived behaviors obtained from overweight and obese people. In Oberexia, as stated above, positive body image and high body satisfaction constitute core components. Although most studies exploring body perceptions involving overweight and obese participants do not report subgroups of participants who underestimate their weight, perceive their body as slim or beautiful, are satisfied with their weight and appearance, and consequently admit to engage in behaviors leading to weight maintenance or even increase, some reports do offer findings that point to the existence of this specific profile.

Specifically, regarding perceived and current weight or BMI, misperception of weight status (i.e., discordance between an individual's actual weight status and the perception of their weight status) has repeatedly been documented among overweight and obese adults. It is also known that a high percentage of individuals with excess weight have a distorted view of their body image toward weight or BMI underestimation or toward the consideration of their weight as "normal" or "appropriate" (^{Atalah, Urteaga & Rebolledo, 2004}; ^{Bhanji et al., 2011}; ^{Duncan et al., 2011}; ^{Ettarh, van der Vijver, Oti & Kyobutungi, 2013}; ^{Gregory et al., 2008}; ^{Mama et al., 2011}; ^{Mueller, Hurt, Abu-Lebdeh & Mueller, 2014}; ^{Sámano et al., 2015}; ^{Yaemsiri, Slining & Agarwal, 2011}). Controlling for other relevant variables, individuals with excess weight are 5 times more likely to underestimate their weight (Atalah et al., 2004). Moreover, the odds of underassessment are 2 to 3 times higher among overweight and obese individuals who perceive their health as good, and 6 to 12 times higher among those who do not perceive their current weight as a health risk factor, with both phenomena increasing as BMI increases (Gregory et al., 2008).

Some researchers have tried to explore the body satisfaction of people with excessive weight. Findings support that a considerable number of overweight or obese individuals are satisfied with their body, particularly those with a distorted body image (^{Benkeser, Biritwum & Hill, 2012}; ^{Bhanji et al., 2011}; ^{Casillas-Estrella et al., 2006}; ^{Ferrari et al., 2012}; ^{Millstein et al., 2008}; ^{Sámano et al., 2015}). In some cases of body dissatisfaction, the desire is for even heavier and bulkier bodies (Benkeser et al., 2012; ^{Mama et al., 2011}). A high percentage of these individuals take into account not only aesthetic reasons ("looking good", "liking my weight") but also health-related reasons ("it is healthy") for feeling satisfied with their body (Sámano et al., 2015) or for having as an ideal body one corresponding to excess weight BMI categories (Benkeser et al., 2012). Perceptions of positive current health status correlate with body satisfaction among individuals with excessive weight (Millstein et al., 2008). Furthermore, feeling happy with one's own weight and body increases by 6 times the risk of underestimating weight (Bhanji et al., 2011).

Therefore, it is not surprising that many of these individuals consider excessive weight as an ideal, wish to maintain or increase their weight and, consequently, make no attempt to control it, as some research has supported (^{Benkeser et al., 2012}; ^{Duncan et al., 2011}; ^{Ettarh et al., 2013}; ^{Mama et al., 2011}; ^{Mueller et al., 2014}; ^{Yaemsiri et al., 2011}). Weight underestimation decreases by 50 to 70% the probability of wanting or trying to lose weight (Duncan et al., 2011).

These findings could indicate a social reality largely ignored to date that would have important health implications, a condition in which overweight and obese individuals perceive themselves as having healthy, beautiful and functional bodies and wish to maintain their weight or even increase it. However, none of the above-mentioned studies aimed at identifying specifically this group of obese individuals; instead, the findings for these figures are mixed with the general results obtained with the whole samples studied.

Based on such findings, which indicate that, among overweight and obese people, there may be individuals who are satisfied with their body and even willing to have heavier or larger bodies (but not athletic ones, with greater weight or size linked to greater muscularity), the present study was specifically designed to estimate the prevalence of Oberexia. With this aim in mind and covering the whole national territory, we explored body perceptions of Spanish individuals in their early and middle adulthood and with excess weight. Specifically, we explored their body perceptions, their body ideals and their body satisfaction, differentiating between two components of body composition, weight and muscularity, in order to rule out the desire to have a (more) heavy and voluminous body due, actually, to the valuation of an athletic body as the ideal appearance. One important characteristic of the above-mentioned studies is that none of them considered the dimension of muscularity (vs. weight) in their evaluation of body perceptions (^{Thompson & Cafri, 2007}), nor the possible differences by gender in relation to this issue. It is noteworthy that none of the reviewed studies explored the possible prevalence of Oberexia neither in the general population nor in specific clinical populations (i.e., individuals with obesity), and thus, this study can make an important contribution to this area of ​​research.

MATERIALS AND METHODS

Measures

Information was collected regarding age, sex, nationality, educational level, employment status, marital status, children (yes/no, if woman: number of pregnancies and age at which the first and last children were born; current pregnancy), whether suffering from any illness and taking any medication or following any treatment or therapy at the time of the study, and, further, whether suffering at the time of the study or had ever had an ED, with indication of the diagnosis, type or main clinical manifestations.

Table 1 Sociodemografic characteristics N = 168 

Body perceptions were assessed using anatomical models or silhouettes corresponding to progressive values ​​of BMI and muscularity (adapted from ^{Oliveira et al., 2011}). Two blocks of 15 anatomical models were presented, and the participant had to indicate which one they considered to be the figure that best suited their current body (perceived body, PBI) and which one they would like to have (ideal body, IBI). In both cases, a double assessment was included, referring both to the body size (from 1 = Very obese to 8 = Very thin) as well as to the corporal constitution (from 8 = Very flaccid to 15 = Very muscular) in order to simultaneously evaluate body shape, weight or size, and body composition or muscularity. The central image corresponds to the silhouette that is the fusion between weight and muscular tone. Male silhouettes were used for men, and female silhouettes for women (^{Thompson, 2004}). Silhouettes have been widely used to evaluate the perceptual representations of the body, usually with different figures in terms of body size or weight (^{Ettarh et al., 2013}; ^{Mama et al., 2011}; ^{Sámano et al., 2015}) and more rarely of structure or body composition, and have good psychometric properties as well as cross-cultural validity (^{Gardner & Brown, 2010}).

Complementarily, participants' perceptions of weight and muscularity were also assessed using two face-valid questions ("I perceive myself as...", from 0 = Very thin to 7 = Very obese; "I think my body composition is...", from 0 = Very flimsy/flabby to 7 = Very strong/muscular). These types of questions have been previously used (e.g., ^{Benton & Karazsia, 2015}).

Body satisfaction was assessed using two indicators: A face-valid item (“How satisfied are you with your current body weight, size and appearance?”, 0 = Not satisfied at all to 7 = Highly satisfied) (^{Ramírez et al., 2018}), as well as the discrepancy between the PBI and IBI (^{Casillas-Estrella et al., 2006}; ^{Oliveira et al., 2011}; Ramírez et al., 2018). Both strategies have shown appropriate psychometric properties.

RESULTS

In terms of the whole sample, the participants perceived their bodies as overweight and not athletic (see Table 2). The participants' ideal body indicates that they would like to have thinner and more toned bodies. The discrepancy between their self-perceptions and their ideal body image is noticeable. Consequently, the participants showed moderate body satisfaction.

Table 2 Descriptive findings N = 168 

Nevertheless, a deeper analysis of the data revealed different realities within the sample (see Table 3). Among the participants, 10.7% perceived their body as being normal in weight or size. The specific questions about weight and body composition make it possible to better understand the participants’ body perceptions, confirming different profiles of body image. In addition, a significant number wished to have overweight or obese bodies, specifically 6.5%. Furthermore, considering the PBI-IBI discrepancy, 4.2% of participants said they wanted to maintain their appearance and figure, and 1.8% indicated that they wanted a body with greater weight and size in terms of fat mass (indicating a desire for a body with a size 1 to 4 levels higher on the scale of silhouettes). In terms of body satisfaction, approximately two in three participants indicated being moderately to highly satisfied with their body.

We conducted a case-to-case analysis of all the combinations of the study variables (data not shown, available upon request), which, along with the previous findings, helped us for the following final analysis. In total, ten participants wanted to maintain or increase their weight (PBI-IBI discrepancy null or positive). A more exhaustive analysis of these cases (see Table 4), considering both the perceptions of weight and muscularity as well as the desired bodies and body satisfaction, leads us to conclude that of all cases, five (3% of the sample) could be cases of Oberexia.

Table 3 Percentage of participants indicating each level of body perceptions N = 168 

Among them, case number 4 (Table 4) stands out as a good indicator of Oberexia: body perceptions of obesity, excess weight and low muscularity, body ideals with excess weight and a low body satisfaction along with a desire to gain weight (and not muscularity). The remaining five cases seem to be participants with athletic bodies wishing to maintain or increase their weight and muscularity level, although there were two cases in which the desired body was less muscular. Figure 2 displays these findings along with those obtained for the whole sample.

Table 4 Combinations of scoring levels on the main variables in cases of null or positive PBI-IBI discrepancy n = 10 

Figure 2 Participants' current body self-perceptions (complete line) and desired body self-perceptions (dotted line). Grey: Whole sample N = 168. Black: Possible cases of Oberexia n = 5. 

DISCUSSION

In the present study, we aimed to estimate the prevalence of Oberexia, identifying possible cases in a Spanish sample of 16 to 60-years-old individuals who were overweight or obese. According to the multidimensional theory of body perceptions of ^{Thompson, Heinberg, Altabe and Tantleff-Dunn (1999}), body image is a multifaceted construct that encompasses self-perceptions of the body and appearance, including thoughts, beliefs, values, attitudes, emotions and behaviors grouped in a perceptual dimension (i.e., accuracy in the estimation of the body or its parts in terms of size, shape or weight), a cognitive-affective dimension (i.e., subjective experiences related to the body or any of its parts, including (dis)satisfaction) and a behavioral dimension (i.e., behaviors derived from body perceptions or to manage body appearance). Therefore, body image incorporates the estimation of body size and shape, the evaluation of its attractiveness, the subjective satisfaction with these perceptions and the emotions and actions associated with them (^{Cash & Smolak, 2011}; ^{Grogan, 2017}). In this study, we have explored two of these dimensions to identify possible cases of Oberexia: the perceptual component, measured through silhouettes considering weight and body composition as well as specific questions for size and muscularity, thus establishing a differentiation between both components of body composition in order to rule out that the desire to have a more voluminous body could in fact be due to the valuation of an athletic body as the ideal body; and the subjective component, evaluated through satisfaction with body perceptions.

The findings of the studies reviewed, as well as those from the present study when the complete sample was considered, indicated that most people with excess weight perceive themselves as overweight and obese (even when they have no accurate perceptions of weight), have reduced body satisfaction and would like to have thinner bodies, in a linear relation to BMI. This may reflect the currently accepted socio-cultural beauty stereotypes, according to which men believe that the masculine ideal body is slim and muscled, athletic-type, and they evaluate their appearance according to it (^{Thompson & Cafri, 2007}), and women believe that the current feminine ideal emphasizes being thin, but also having a toned and muscle-defined body (^{Benton & Karazsia, 2015}; ^{Cash & Smolak, 2011}).

Simultaneously, however, findings lead us to conclude that there is a subgroup of overweight and obese individuals whose body perceptions do not match the reality of their body, who perceive themselves as thinner than they are, who take great satisfaction in having such a kind of body and who would like to be even heavier or larger. In addition, there are obese individuals who perceive themselves as such but are also satisfied with their appearance and have a positive judgment of obesity and being overweight (^{Sámano et al., 2015}). The most important contribution of this study is to have confirmed, for the first time in a study specifically focused on this purpose, the existence of a small but interesting subgroup of people with excess weight whose body perceptions are distorted in a positive fashion, who experience a high degree of satisfaction with their body and who wish to maintain this condition. Approximately one in 10 participants perceived themselves as being normal in weight or size and one in 20 as being thin and having somewhat muscular bodies. Moreover, one in 15 wanted to have an overweight or obese body, and one in 55 wanted a heavier/bigger body. The use of silhouettes corresponding to different degrees of BMI and muscularity, as well as specific questions related to weight and body composition, allowed us to distinguish between those who have an assessment of their current and ideal body in terms of athletic vs. obese bodies.

According to our findings, among individuals with excess weight, up to 3% may be at risk of suffering or already suffer from Oberexia. Therefore, and particularly due to its possible consequences for health (e.g., high risk of morbidity and mortality associated with obesity and severe obesity), Oberexia should be more thoroughly investigated as a condition with a high relevance for public health. Our results should be taken with caution because they are only preliminary, but they may attract the attention of researchers and health officials in order to continue research in this field.

Furthermore, EDs are common among overweight and obese individuals. Obesity is a risk factor for EDs, and in a very high percentage of cases both conditions coexist. Several reviews and meta-analyses as well as clinical and epidemiological studies link obesity with anorexia and, more frequently, with disorders with a bulimic/binge-eating component (^{Hill, 2007}). In addition, obesity and EDs share similar risk factors, particularly those related to socio-cultural pressures regarding the body and the prevailing beauty canons, dissatisfaction with body perceptions and risk behaviors for weight and appearance control (^{Haines & Neumark-Sztainer, 2006}). This has led to the proposal of including obesity along with EDs within a broad spectrum of weight-related disorders (^{Sánchez-Carracedo, Neumark-Sztainer & López-Guimera, 2012}). Moreover, although each ED is characterized by a specific conglomerate of clinical manifestations, it has been proposed that the main cause of all EDs and their fundamental psychopathological nucleus is a distortion of body perceptions (^{Fairburn, Cooper & Shafran, 2003}; Fairburn & Cooper, 2011). Noteworthy, the prevalence of Oberexia found in the present study is similar or significantly higher than that of EDs (e.g., ^{Smink, van Hoeken & Hoek, 2012}). Consequently, we encourage the exploration of Oberexia in relation to EDs, considering their main clinical characteristics.

This study suffers from some limitations that should be conveniently addressed in the future. First of all, although the initial sample was of a considerable size and nation-wide, the subsample of overweight and obese individuals was reduced and does not parallel national data on obesity prevalence (^{Valdés et al., 2014}). Furthermore, we were not able to disaggregate by sex because of the small number of participants. However, excess female body weight is valued in many places due to racial/ethnic and socio-cultural influences (^{Benkeser et al., 2012}; ^{Duncan et al., 2011}; ^{Yaemsiri et al., 2011}). Moreover, excess body weight has generally been associated with wealth and health and considered a desirable attribute in many nations, particularly in economically deprived ones (Benkeser et al., 2012; ^{Ettarh et al., 2013}). Thus, in future studies, larger samples should be used ensuring the heterogeneity and representativeness of the participants in order to replicate our findings in people of both sexes with different educational and socio-economical levels and ethnic-cultural backgrounds.

Secondly, a major limitation is not having considered the behavioral practices used by the participants for weight, body and appearance management, which constitute the third dimension of body perceptions according to the model of ^{Thompson et al. (1999}) (i.e., the behavioral dimension, referring to the use of healthy or risky strategies for self-regulating the body). When researching on Oberexia, it is very important to explore the consequences at a behavioral level derived from positive body perceptions as well as high satisfaction with them in obesity. In our proposal of Oberexia, these behavioral strategies are risky practices because they would allow one to maintain a high weight or even increase it in an already morbid condition, obesity, thus seriously compromising health status and quality of life. Future research should explore these weight-regulating behaviors as well as their role in Oberexia. This is an extremely relevant issue given that interventions promoting lifestyle modifications for weight control face a difficult task in encouraging behavioral changes and are likely to have little impact on an individual who does not believe that she/he is overweight or that being overweight puts one at risk for increased morbidity (^{Gregory et al., 2008}).

Thirdly, we based our data on self-reports. Self-reports are appropriate for the assessment of body perceptions and body satisfaction but should be complemented with objective data (e.g., structural parameters for BMI calculation). There is a debate on BMI for the detection of excess weight (^{Ramos-Silva, Savegnago-Mialich, Hoffman & Jordao, 2017}), but findings supports its utility (^{Doménech-Asensi et al., 2018}). In addition, no differences have been found between self-reported and measured weight, height and BMI (^{Bibiloni et al., 2016}). Moreover, like in other studies (^{Benton & Karazsia, 2015}), an online survey was used to collect the data, so it is possible that only those individuals with economic or educational resources allowing access to it or those highly motivated to collaborate in this type of studies might have participated. Although some criticisms have been applied to online assessments (e.g., sample biases, withdrawal, lack of control), we followed published recommendations in order to potentiate its multiple advantages and to enhance quality (e.g., International Test Commission, 2006).

Finally, this is a descriptive study whose aim was the identification and exploration of a subgroup of individuals with excessive weight who have body distortions towards low weight and who consider fatness to be "healthy" and "beautiful". Future research should use other methodological resources (e.g., qualitative and mixed quantitative-qualitative methodologies), research designs and analytical procedures to deepen the description, identification and differentiation of Oberexia.

CONCLUSIONS

In conclusion, this study has attempted to present clues leading to the existence of Oberexia, which should deserve greater research and clinical efforts because of its potential importance at the social, sanitary and personal levels. It is very likely that this condition is already affecting an important part (3% based on our findings, in line with the prevalence of EDs) of the population with excess weight, and it is extremely dangerous due to its potentially associated morbidity and mortality risks. Oberexic individuals not only do not perceive excess weight as a threat to their health but also value ​overweight and obesity in a positive way, so that their behavioral efforts will be aimed at maintaining or even increasing the weight and volume of their body, with the high risks that this would entail. At the applied level, it is important to make advances in the detection and preventive and therapeutic approach of this condition in line with EDs therapies (APA, 2013). Individuals suffering from Oberexia might thus benefit from interventions aimed not only at weight control (obesity) but also at ED management (body image).