Protein In Nutrition
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Proteins are polymer chains made of amino acids linked together by peptide bonds. Amino acids can be divided into either essential amino acids or non-essential amino acids. Proteins and carbohydrates contain 4 kcal per gram as opposed to lipids which contain 9 kcal per gram. The essential amino acids, which must be obtained from food sources, are leucine, isoleucine, valine, lysine, threonine, tryptophan, methionine, phenylalanine and histidine. On the other hand, non-essential amino acids can be made by the body from other amino acids. The non-essential amino acids are arginine, alanine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, proline, serine, and tyrosine. In nutrition, proteins are broken down in the stomach during digestion by enzymes known as proteases into smaller polypeptides to provide amino acids for the body, including the essential amino acids that the organism cannot be biosynthesized by the body itself. Thus, protein from one's diet should provide both essential and non-essential amino acids for protein synthesis. Most animal and certain vegetable proteins are considered complete proteins with a full complement of essential amino acids in adequate proportions. People who avoid animal products for religious and health reasons may practice protein combining to get the essential amino acids in their diet. Lentils and rice combined is a plant source of protein. From Wikipedia under the
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