Proteins, are biochemical compounds consisting of one or more polypeptides typically folde into a globular or fibrous form, facilitating a biological function. What it means in easy words, the proteins are just a chain of some amino-acids witch are the chemical molecules of life.Like other biological macromolecules such as polysaccharides and nucleic acids, proteins are essential parts of organisms and participate in virtually every process within cells. Many proteins are enzymes that catalyze biochemical reactions and are vital to metabolism. Proteins also have structural or mechanical functions, such as actin and myosin in muscle and the proteins in the cytoskeleton, Proteins are also necessary in animals’ diets, since animals cannot synthesize all the amino acids they need and must obtain essential amino acids from food. Through the process of digestion, animals break down ingested protein into free amino acids that are then used in metabolism.Proteins were first described by the Dutch chemist Gerardus Johannes Mulder and named by the Swedish chemist Jöns Jacob Berzelius in 1838.Early nutritional scientists such as the German Carl von Voit believed that protein was the most important nutrient for maintaining the structure of the body, because it was generally believed that “flesh makes flesh.” The central role of proteins as enzymes in living organisms.The first protein to be sequenced was insulin, by Frederick Sanger, in 1949. Sanger correctly determined the amino acid sequence of insulin, thus conclusively demonstrating that proteins consisted of linear polymers of amino acids rather than branched chains, colloids, or cyclolsProtein requirements depend on a child’s age and weight. For example, the average 4-6 year old preschooler requires about 22 grams of protein a day, while an older 7-10 year old requires about 28 grams of protein a day.
Common protein rich foods can include: