Trends in obesity prevalence among Brazilian adults from 2002 to 2013 by educational level.

Background: Obesity ranks as a major public health problem in many countries in the world. The obesity-socioeconomic status relationship is not well established in middle-income countries.

Methods: The aim of this study was to estimate the obesity and overweight trends from 2002 to 2013 by sex, age, and educational levels among Brazilian adults. The panel prevalence trend study was conducted, considering the sample weights and study design. Three nationwide surveys were analyzed: the Household Budget Survey 2002/2003 and 2008/2009, and the National Health Survey 2013. The total sample was 234,791 adults aged 20-59 years.

Results: The prevalence of obesity increased from 7.5 to 17.0% from 2002 to 2013 among adults aged 20-39 years and from 14.7 to 25.7% among those aged 40-59 years, slightly higher among young women. In each survey, education was positively associated with the prevalence of obesity among men, whereas this association was negative among women. The greatest increase in the prevalence of obesity was 90% (11.9 to 22.5%) and occurred from 2008 to 2013 among women with secondary educational level, whereas at the pre-primary level there was a 42% (20.4 to 29.0%) increase.

Conclusions: Obesity prevalence in Brazil continued to increase, mostly among women with secondary education. Policies aimed at reducing the prevalence of obesity should consider sociodemographic characteristics in the population.