Gym Members Show Lower Nutrition Knowledge than Youth Engaged in Competitive Sports

Objective: Adolescents may be vulnerable to misleading nutritional information and adopt unhealthy food habits. In addition, specific features related to physical training, either aimed to improve fitness or to comply with sport demands, may influence food habits of the youth. This cross-sectional study was aimed to compare nutrition knowledge, food habits and adherence to Mediterranean diet in youth engaged in fitness training, competitive sports or inactive. Methods: Three questionnaires, the General and Sport Nutrition Knowledge (GeSNK) questionnaire, a food habit questionnaire and the KIDMED were administered to gym members, athletes engaged in volleyball, long-distance swimming, and gymnastics, and inactive adolescents. Results: The total sample included 211 youth (age 16.8 ± 1.7 years). Gym members, like the inactive youth, had lower general and sport-related nutrition knowledge compared to athletes (p = 0.001). In the whole sample, general nutrition knowledge was positively associated with healthy food habits (p < 0.01) and adherence to the Mediterranean diet pattern (p < 0.02). Conclusions: Gym members had a level of nutrition knowledge lower than young athletes and similar to inactive youth. Healthy food habits were related with nutrition knowledge among adolescents. Specific nutritional education programs are needed to address food habits in fitness settings.