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Introduction: For strength training to be effective, proper nutrition is necessary, based on providing the right amount of energy, as well as optimally balanced macronutrients. Nutrition among bodybuilders, weightlifters and powerlifters differs because the training aims, training methodology and competition itself are different. Objective: Strength sports athletes differ from each other in body structure, training methodology and form of competition. The aim of the study was to try to answer the question whether their diets affect somatic variables and leg power. Materials and Methods: 60 people remained, which were divided into 4 groups, including 15 weightlifting competitors, 15 powerlifters, 15 bodybuilders and 15 men not training competitive sport Results: The quality of the diet used had an impact on the body composition in the control group. In the group of powerlifters, there was a significantly positive correlation between the daily intake of carbohydrates and the percentage of body fat (p |