Food supplements comprising Tribulus terrestris extract, folic acid and an orotic acid or a derivative thereof. The food supplements optionally, but preferably, include effective amounts of nutrients selected from the group consisting of Vitamin A, Vitamin E, Vitamin C, Vitamin B1, Vitamin B2, Vitamin B6, Vitamin B12 and combinations thereof. The food supplements are suitable for supplementing the diet of an athlete, for decreasing body fat and increasing strength, lean muscle mass and endurance.