Eat a larger meal if you have three to four hours before you begin your exercise. Limit the amount of fatty foods such as fast food, eggs, meat, and cheese that you eat for your pre-exercise meal. These foods take much longer to digest and may make you feel sluggish and tired. Avoid high-bulk, gas forming foods such as broccoli, baked beans, or bran cereal. These foods may cause gas pains during exercise. Avoid sugars and sweets, especially soft drinks and candy, less than 1 hour before training. High-sugar foods will give you quick energy, but it won't last long. Do not try new foods before a competition. You may have trouble digesting a food you have never eaten before.