Nutrition and Absorption
Types of Nutrients
Carbohydrates Proteins Fats

All carbohydrates have the general formula Cn(H2O)n. Most foods contain carbohydrates, which the body breaks down into simple sugars for use as a readily available source of energy. For example, glucose is used immediately by the brain and muscles and the excess is stored as glycogen or fat for future use. Protein molecules play an important role in the structure of the body. Protein materials make up the muscles, cartilage, ligaments, skin and hair. Antibodies, enzymes and hormones are vital in maintaining the body's functions. Lipids are made of hundreds of fatty acids. Fatty acids are important as carriers of fat-soluble vitamins. Lipids are also a concentrated energy source, transporting energy as well as storing it in fat cells.