Proteins exist in all the organisms. The cells need proteins to carry out all its functions. Amino acids form these proteins which are organic compounds. The process of formation of protein is carried out in the stomach when food is broken down and digested. The metabolic activity in the body requires proteins. Calories, which we know as the energy, are produced from protein, fat and carbohydrates from the food that we take. Dairy products in various forms including cheese and milk, eggs, nuts, legumes and meat are the main source of proteins. The food particles are broken down in the stomach continuously from which proteins are derived. The proteins are broken down through digestion by enzymes. The estimated requirement of protein of women are said to be lesser than men. While the men require 56 grams of protein per day, the women require 46 grams of protein per day. When the intake of protein is lower than the required intake, protein deficiency sets in.