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NUTRIENTS: FUNCTIONS OF PROTEINS
Proteins arc digested to amino acids which are absorbed through the walls of the small intestine into the portal blood circulation for delivery to the liver and the tissues of the body. The cells of each tissue and organ remove the kinds and amounts of amino acids required for a given function.
Structural role
Proteins are essential components of the cells of all living things – plants, animals, and even microorganisms. Every tissue and fluid in the body except bile and urine contains some protein. The human body consists of about 18 to 20 per cent protein. Muscles account for most of this protein. It is not always realized that the framework of the skeleton into which minerals are deposited also consists of protein.
The need for protein continues throughout life since there is a constant need for new cells to replace those that have broken down. For example, the red blood cells have a life span of about 60 to 120 days, while cells of the intestinal mucosa are renewed every few days. When cells are broken down, there must be equal numbers of new ones to take their places.
Throughout the period of pregnancy, and in infancy, childhood, and adolescence, protein is continuously required for the building of the marvelous variety of new tissues as well as for replacement to take care of wear and tear.
Regulatory functions
Most of the regulatory materials of the body, including enzymes and hormones, are protein in nature. For example, the digestion of food requires certain enzymes that are constructed from amino acids. Thyroxin, a hormone that regulates energy metabolism, and insulin, which regulates the blood sugar level, contains specific kinds and amounts of amino acids. The red coloring matter of the blood, hemoglobin, is an iron-containing protein that carries oxygen to the tissues. Other proteins in the blood regulate osmotic pressure and water balance. The body’s defense against disease is brought about by antibodies that are composed of protein.
Energy
Proteins furnish 4 kcal per gram. If the diet contains more protein than is needed, the nitrogen will be removed from the excess amino acids by the liver. The nitrogen is excreted in the form of urea by the kidney. The remainder of the amino acid molecule is then used as an immediate source of energy, or it may be stored in the form of fat. If the diet docs not contain sufficient calorics from carbohydrate and fat, the protein will be used for energy rather than for building or replacing tissues.
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