title: Factors associated with risk of low dietary fiber intake in adolescents.
abstract: OBJECTIVE
  To evaluate dietary fiber intake among adolescents and to analyze factors associated with the risk of insufficient consumption of this nutrient.
  
  
  METHODS
  Cross-sectional study of 722 adolescents from the town of São Leopoldo, RS, Brazil. Sampling was by clusters, with a systematic randomization of 40 census sectors and residences, including all individuals aged 10 to 19 years. The adolescents' weight and height were measured and sociodemographic data on their families recorded. A 24-hour dietary recall and a frequency survey were used to assess dietary intakes. The quantity of dietary fiber in diets was calculated using Nutwin nutrition support software (Programa de Apoio à Nutrição), developed by the IT Department at Universidade Federal de São Paulo (UNIFESP). Statistical analysis was by means of logistic regression, employing a hierarchical model.
  
  
  RESULTS
  The prevalence of insufficient dietary fiber intake was 69% among girls and 49.7% for boys (p < 0.001). The determinant factors of this condition among boys were non-habitual consumption of beans (OR 2.65; 95%CI 1.05-6.68) and excessive fat intake (OR 2.67; 95%CI 11.23-5.83). For girls factors were increased age (OR 5.33; 95%CI 2.33-12.2), non-habitual consumption of beans (OR 3.01; 95%CI 1.44-6.53), excessive fat intake (OR 1.85; 95%CI 1.01-3.37), dieting for weight loss (OR 2.50; 95%CI 1.10-5.70) and presence of overweight (OR 2.06; 95%CI 1.04-4.07).
  
  
  CONCLUSIONS
  These results admit of the conclusion that excessive fat consumption and non-habitual consumption of beans are strongly linked with the risk of insufficient dietary fiber intake in both sexes and that females exhibit a greater number of risk factors for this outcome.
authors.affiliation: Fundação Faculdade Federal de Ciências Médicas de Porto Alegre (FFFCMPA), Porto Alegre, RS, Brazil. marciavitolo@hotmail.com
authors.forename: Márcia R
authors.initials: MR
authors.lastname: Vitolo
authors.forename: Paula D B
authors.initials: PD
authors.lastname: Campagnolo
authors.forename: Cíntia M
authors.initials: CM
authors.lastname: Gama
mesh_terms: D000293:Adolescent; D017195:Adolescent Nutritional Physiological Phenomena / Q000502:physiology*; D000328:Adult; D017677:Age Distribution; D001938:Brazil / Q000453:epidemiology; D003248:Constipation / Q000453:epidemiology / Q000209:etiology; D003430:Cross-Sectional Studies; D004034:Diet Surveys; D004043:Dietary Fiber / Q000008:administration & dosage*; D005247:Feeding Behavior / Q000502:physiology*; D005260:Female; D005638:Fruit; D006801:Humans; D008297:Male; D009752:Nutritional Status; D009765:Obesity / Q000453:epidemiology / Q000209:etiology; D012307:Risk Factors; D017678:Sex Distribution; D012737:Sex Factors; D014675:Vegetables