Your body requires Carbohydrates as the key source of energy. Carbohydrates should make up 50% of your total daily fuel intake. You should have a regular intake of low glycemic Carbohydrates to aid a steady stream of glucose into the blood stream. A standard training diet should have around 2g of carbs per lb of body weight. Low glycemic foods can also help towards weight loss due to a slower rate of digestion which creates a feeling of fullness.