Validade relativa de questionário de frequência alimentar com suporte de imagensRelative validity of a food frequency questionnaire supported by images

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Objective: To evaluate the validity of food photographs used to support the reporting of food intake with an FFQ designed for adolescents from Rio de Janeiro, Brazil. Design: A set of ninety-five food photographs was elaborated. The photographs' evaluation process included the acknowledgement of foods and portions in the pictures. In the identification of foods (ninety-five photographs) and typical portions (twelve photographs), the adolescents were requested to answer a structured questionnaire related to the food photographs. The identification of the portion size of amorphous foods (forty-three photographs) was performed using three different portion sizes of actual preparations. The proportions (and 95 % confidence intervals) of adolescents who correctly identified foods and portion size in each photograph were estimated. Setting: A public school in Niterói, Rio de Janeiro State, Brazil. Subjects: Sixty-two adolescents between 11?0 and 18?9 years old, randomly selected. Results: At least 90 % of adolescents correctly identified the food in ninety-two photographs and the food in the three remaining photographs was recognized by 80-89 % of the adolescents. At least 98 % of the adolescents correctly identified eleven typical or natural portions in the food photographs. For amorphous foods, at least 70 % of teenagers correctly identified the portion size in the photograph of thirty-one foods; for the other photographs, the portion size was correctly recognized by 50-69 % of the adolescents for eight foods and by less than 50 % of adolescents for four foods. Conclusions: The analysed photographs are appropriate visual aids to the reporting of food consumption by adolescents.

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The objective of this study was to assess the agreement between the Brazilian Healthy Eating Index -Revised (BHEI-R), estimated by a food frequency questionnaire (FFQ) and multiple 24-hour recalls (24h-R)

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Objective To estimate the usual consumption of fruits and vegetables by Brazilian adolescents. Methods We used 24-hour dietary recall data from the Study of Cardiovascular Risk in Adolescents conducted in 2013-2014 with 71,740 adolescents between 12 and 17 years old. The usual consumption of fruits and vegetables was estimated in the Statistical Analysis Software using the model of the United States National Cancer Institute, and evaluated according to sex, age, place of residence, economic class, and nutritional status of the participants. Results The mean of usual fruit and vegetable consumption was estimated at 171g/day, mostly fruits (128g/day), mainly in the form of fruit juice (64.8%). The minimum fruit and vegetable consumption of 400g/day recommended by the World Health Organization was reached only by 2% of the adolescents. The adolescents’ socioeconomic class or nutritional status had no impact on the usual fruit and vegetable consumption, but adolescents from northern Brazil had a significantly lower consumption than those from the midwestern region. Orange was both the most consumed fruit on a daily basis (mean of 42.6g/day, 90% as juice) and the most reported fruit (by 12.7% of the adolescents), followed by apples (10g/day; 5.6%) and bananas (8.4g/day; 8.3%). Tomato was the most consumed vegetable (9.2g/day), reported by 11.5% of the adolescents. Conclusion Public health policies are necessary to encourage fruit and vegetable consumption among Brazilian adolescents, including of pure juice, essential foods to prevent chronic diseases in adulthood.