The energy is used for the growth and repair of cell parts and for other cell activieies. It is formed from glucose and stored in the liver and muscle cells. Glycogen contains stored energy. Glycogen is converted back to glucose as it is needed by the body's cells. Proteins Protein is a nutrient made of amino acids.
All amino acids are organic compounds that contain carbon, hydrogen, oxygen, and nitrogen.
Two amino acids contain sulfur. Amino acids are building blocks of larger protein molecules. More than 20 different amino acids are required to keep your body healthy. The 20 amino acids can form an almost endless number of proteins. Amino acids are used for the growth and repair of body tissue and to make hormones, enzymes, and antibodies.