Male or female? Which position do you play? Are you someone who uses speed and quickness or someone who uses strength, or a goalie who uses agility and girth? And how old are you? If you're young, you don't want to do anything too rash. Basically, and this is very basic, for strength, you generally need protein, for energy and endurance you need complex carbohydrates, and for antioxidant protection you need electrolytes and lots of colored vegetables. More details will get a better answer, but you might try writing to your favorite pro soccer player or sports coach and see how they've experimented over the years.