Results indicate the existence of associations between greater energy contribution from ultra-processed foods and higher BMI and WC, which are independent of total energy intake. These findings corroborate public policies designed to reduce the intake of this type of food.

OBJECTIVE: To verify in male and female Brazilian adolescents the association of demographic, psychosocial, behavioral and sociocultural characteristics with the regular practice of physical activity. METHODS: The sample consisted of 109,104 adolescents from all Brazilian states attending the 9th year of elementary education in 2012. The response variable was the regular practice of physical activity (300+ minutes/week). The explanatory variables were grouped into four fields: demographic, psychosocial, behavioral and sociocultural. The Poisson regression was stratified by sex to evaluate the association. RESULTS: The prevalence of active adolescents was 20.2%, higher in boys (27.9%) than in girls (13.1%). It was observed a greater practice of physical activity in boys of lower age group, children of mothers with higher schooling, who consumed healthy foods such as beans, fruits, vegetables, and milk, as well as among those with family supervision. At the same time, unhealthy habits such as insomnia and alcohol consumption were also positively associated with physical activity. In girls, greater physical activity was observed among those who lived with mothers and whose mothers had higher schooling. In addition to family supervision, the practice of physical activity in girls was also positively associated with the frequency of meals with their parents. However, as in boys, insomnia and alcohol consumption were associated with an increase in the practice of physical activity. CONCLUSIONS: One-fifth of adolescents practice physical activity regularly, demonstrating the need for specific public policies to increase the percentage of active young people in the country. Maternal schooling, healthy eating habits and family supervision were associated with regular physical activity in boys and girls, evidencing the importance of the family for the acquisition of healthy habits in this age group.

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Introdução:A adolescência é estágio da vida caracterizado por complexas transformações somáticas, sociais e psicológicas. Objetivo: Investigar a associação da percepção da imagem corporal com o estado nutricional de adolescentes escolares da região do Barreiro, na cidade de Belo Horizonte. Métodos: Estudo observacional de corte transversal que utilizou o cálculo do índice de massa corporal (IMC) percentilar para avaliação do estado nutricional e um questionário autopreenchido para avaliação da percepção corporal. Procedeu-se à análise estatística dos dados, com uso do teste Qui-Quadrado para verificar se havia associação entre as variáveis e foi utilizado o nível de significância de 5%. Resultados: Foram avaliados 119 adolescentes, com média de 14,4 ± 0,7 anos de idade, sendo 56,4% do sexo feminino. Verificou-se prevalência de 24,4% de excesso de peso entre os adolescentes. Não foi encontrada diferença do estado nutricional segundo o sexo (p = 0,207), mas observou-se associação entre a percepção corporal e o estado nutricional (p < 0,001). Quase um terço daqueles que se consideram como em situação normal gostariam de perder peso, enquanto 14,8% do mesmo grupo gostariam de ganhar peso. Entre os jovens que se consideram magros, mais da metade (55,6%) acredita que seria bom ganhar peso e a maioria daqueles que se consideram acima do peso acreditam que seria uma boa ideia perder peso. Conclusões: O excesso de peso e a insatisfação corporal são de alta prevalência entre os adolescentes. Intervenções para promover hábitos de vida saudáveis nesta fase devem envolver pais e escolas, bem como campanhas de mídia e desenvolvimento de políticas públicas.Palavras-chave: Adolescente; Estado nutricional; Imagem corporal. RESUMO Body image perception and nutritional status among teenage students of Barreiro region in Belo Horizonte