Carbohydrates are the most efficient source of energy for an athlete. Starches and sugars are the most common form. Since carbohydrates are the primary source of energy and are not as easily stored as fats, a normal man has only enough in his bloodstream for half a day of light activity. Carbohydrates from cereal grain products, such as pasta and bread, should total almost fifty percent of an athletes calories in a day. Proteins are components in all body tissues and are used in growth and repair.
Proteins are also present in enzymes, hormones, plasma, and antibodies.
Proteins are easily available in grains and animal tissues. The most effective way to intake proteins is through a variety of vegetables to get the optimum balance. This can be increased slightly with very small amounts of animal tissue. An athlete must be careful with ingesting proteins for they are often coupled with fat and will lead to undesired results. The easiest way for an athlete to receive the right amounts of nutrients is to simply eat a well-balanced diet.