Each amino acid contains an amino group, an acidic group, and a unique side chain. C bound to h, amino group (n), acidic group, and side chain. Animal protein: provide most concentrated sources of protein. Provide vitamin b, readily absorbable sources of minerals, iron, zinc, calcium. Amino acid pool: all the amino acids in body tissues and fluids that are available for use by the body. Alpha-carotene: provitamin a carotenoid, not converted into retinoids as efficiently as beta- carotene. Alpha-tocoperol: only form of vitamin e the body can use to meet requirements. Atrophic gastritis: inflammation of stomach lining that results in reduced secretion of stomach acid, microbial overgrowth, and, in severe cases, a reduction in the production of intrinsic factor. Antioxidant: substance that decreases the adverse effects of reactive molecules on normal physiological function. Atp: form of energy used to run the body. Beriberi: thiamin deficiency disease that causes weakness, nerve degeneration, and in some cases, heart changes.