The aim of this study was to analyze adolescents' diet quality and associated factors using the Revised Diet Quality Index (DQI-R). A cross-sectional study was performed with 1,326 adolescents from public and private schools. Food intake was measured using a food frequency questionnaire. Crude prevalence ratio was used to evaluate the association between high DQI-R (≥ 75th percentile) and independent variables. Variables with p-value < 0.20 were included in the Poisson regression analysis. Mean DQI-R was 75.1 points (95%CI: 74.8-75.5). Higher DQI-R scores were associated with ≤ 2 hours per day of sedentary activities (e.g., TV, computer, and videogames), ≥ 300 minutes per week of physical activity, and overweight. Healthy lifestyle was associated with better diet quality. The results emphasize the importance of encouraging physical activity, reducing the number of daily hours in sedentary activities, and intervening in adolescents' eating habits.

OBJECTIVE: To analyze the dietary quality of adults and to identify associated factors. METHODS: Cross-sectional study carried out in a sample of adults (n=195), aged 20-50 years, of both genders, from a population-based study in Cuiabá, Mato Grosso, Brazil. Food consumption data was collected by a food frequency questionnaire. Sociodemographic, lifestyle, anthropometric, and body composition data were also collected. Diet quality was analyzed by the Brazilian Healthy Eating Index-Revised. The associations were estimated by Poisson regression. RESULTS: The mean Brazilian Healthy Eating Index-Revised score was 75.2 points (CI95%=74.2-76.1), which differed significantly between the genders (p=0.03). Women had higher scores for whole fruit and sodium (p<0.01), while men had higher scores for oils, nuts, and fish fat (p=0.02). Individuals aged >30 years had higher total Brazilian Healthy Eating Index-Revised score and higher scores for the groups whole fruit; saturated fat; and calories from solid fats, alcoholic beverages, and added sugar (p<0.01). The Poisson regression between high Brazilian Healthy Eating Index-Revised and the independent variables showed that high Brazilian Healthy Eating Index-Revised was associated with being female, being aged 30 years or more, and being from families whose household head had 8 or more years of formal education. CONCLUSION: The factors associated with high Brazilian Healthy Eating Index-Revised were age, gender, and education level of the household head.