Abstract
ABSTRACT Objective To examine the association of body image dissatisfaction (BID) with body mass index (BMI) trajectory among students from a metropolitan area of Rio de Janeiro. Methods Data were analyzed for 809 middle school students followed from 2010 to 2013, and 1131 high school students followed from 2010 to 2012. BID was assessed using a body silhouettes scale. Type of school (public and private) was used as a proxy of socioeconomic status. Results In the middle school cohort, girls from private schools who wanted to have smaller and bigger silhouettes gained fewer BMI units than those who were satisfied with their body image ( p < 0.05). In the high school, girls from private schools who wished to have bigger and smaller silhouettes experienced greater BMI increase than girls who were satisfied with their body image ( p < 0.05). Also, in the high school cohort, boys from public schools who wished to have smaller and bigger silhouettes experienced smaller BMI increase than boys who were satisfied ( p < 0.05). Conclusion BID may be related to the BMI trajectory in girls from private schools and in boys from public schools.
Highlights
Body image dissatisfaction (BID) is defined as a body or shape negative self-evaluation, that is, the difference between the self-perceived body and the desired body by the individual[1]
A prospective study, the Adolescent Nutritional Assessment Longitudinal Study (ELANA), followed two cohorts of adolescents: a) those attending the sixth grade of middle school in 2010, meaning early adolescence, evaluated annually until 2013 and b) those attending the first grade of high school in 2010, evaluated annually until 2012, meaning intermediate or late adolescence[23]
The mean age was higher for adolescents with only one body mass index (BMI) measurement, and there was more missing data in the public school
Summary
Body image dissatisfaction (BID) is defined as a body or shape negative self-evaluation, that is, the difference between the self-perceived body and the desired body by the individual[1]. Body image issues as BID16 and weight/shape overvaluation[17] has grown in modern society in which the number of individuals with overweight and obesity has increased significantly[18] In this context, there is a paradox between the growing food offerings that favour the increase of obesity and the constant pressure to be thin[19]. There is a paradox between the growing food offerings that favour the increase of obesity and the constant pressure to be thin[19] The vulnerability to this pressure and, BID generally can be associated to weight status[7,8,9,10,11,12,13,14,15], female gender[9,10,20] and high socioeconomic level (mainly in adolescents from other countries)[3,21]. In addition to associations well established in cross-sectional studies, we believe that dissatisfaction may be associated with changes in the BMI trajectory in these groups during adolescence
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