Association of dietary patterns and body phenotypes in Brazilian adolescents

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Abstract
Objectives: to investigate the association between dietary patterns, physical activity, and body phenotypes in adolescents. Methods: this school-based cross-sectional study involved 1,022 adolescents aged ten to 19 years. Dietary patterns and body phenotypes were defined using a principal component analysis. Body phenotype was defined using anthropometry, body composition, biochemistry, sexual maturation, and dietary patterns from 19 food groups, using a food frequency questionnaire. The association between the dietary patterns and body phenotypes was assessed using a linear regression model. Results: five body phenotypes (BP1adiposity, BP2puberty, BP3biochemical, BP4muscular, BP5lipids_biochemical) and five dietary patterns (DP1ultraprocessed_foods, DP2fresh_foods, DP3bread_rice_beans, DP4culinary_preparations, DP5cakes_rice_beans) were identified. There were higher BP_adiposity scores for obese adolescents, but energy expenditure was similar for obese and non-obese adolescents. Physical activity was positively associated with BMI, BP_adiposity, and BP_puberty. We observed a negative association between DP_ultraprocessed_foods and BMI, and a positive association between DP_fresh_food. DP_fresh_foods was positively associated with BP_adiposity; DP_ultraprocessed_foods and DP_culinary_preparations were negatively associated with this phenotype. BP_biochemical was negatively associated with DP_fresh_foods. Conclusion: we identified a negative association between a dietary pattern composed mainly of ultra-processed foods, fresh foods, and BP_adiposity. These associations need to be better explored, especially in adolescents, as both dietary patterns and phenotypes were defined using multivariate analysis.

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