Proteins
Proteins are the structural components of the body that is the basis of cells, tissues and organs. They represent a large group of organic compounds consisting of carbon, hydrogen, nitrogen and oxygen atoms. Some of them also contain sulfur and phosphorus. If the protein digested them into smaller units, amino acids. Of the 20 essential amino acids can be produced by the body 12, while the other, the so-called essential amino acids must be from food.
Proteins to repair worn out or sick tissue and build new ones. It is used in the formulation of hormones, enzymes, red blood cells and antibodies. It also provides amino acids necessary for the growth of the fetus during pregnancy, and for the production of milk protein during lactation. Proteins are typically found in foods derived from plants and animal sources. Plant sources include beans, peas, beans, whole grains, nuts and seeds, while red meat, poultry, fish, milk, cheese, yogurt and eggs from animals. Red meat is a good source of essential amino acids, iron, and is traditionally regarded as “first class” protein. But too much consumption of red meat may be harmful, because it is a major source of unwanted saturated fatty acids. You can eat more fish or chicken without the skin instead of body fat than red meat. Vegetarians can from many plant sources, whole grain cereals and low-fat dairy products. Protein deficiency especially in infants and children, could lead to an increase in growth retardation, severe wasting of muscles, etc.
Dietary protein requirements, depending on age and physical condition. Part of the protein in the diet or the wasted energy needs. So calorie intake should be sufficient to require the protein or the maximum use, taking into account the above factors.