There are three basic nutrients known as macronutrients :

1. Protein , composed of various amino acids, provides the building blocks for muscle tissue. It is also a component of all organs, and is involved in the structure of skin, bones, and tendons as well as being involved in many bodily functions (all enzymes are proteins).

2. Carbohydrates, fuel for energy, is composed of a variety of less complex or more complex sugar and starch molecules.

3. Fats (or oils), the nutrient that contains the most densely packed energy stores.

Water is also an essential nutrient. It constitutes 72 percent of muscles and most bodybuilders drink liters of it a day. In addition, nutritional supplementation can include a number of other substances such as herbs and hormones.

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