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.

A number of health problems can be caused due to protein deficiency. It may even prove fatal in extreme cases. A protein deficiency disease is Kwashiorkor which exhibits the symptoms of diarrhea, fatty liver, edema of the legs and belly, failure to grow, inactivity, flaky skin and apathy. Protein deficiency is also known to be one of the causes of mental retardation. Poor people who face chronic hunger or are malnourished or take food low in protein are prone to protein deficiency. There are also known instances of people who are on to weight loss dieting becoming deficient in protein. Older people who are not taking a balanced diet are susceptible to protein deficiency. This might also be the condition of people who are just on their road to recovery from trauma, surgery or ill health. An intake of protein rich food can actually offset such a condition.

There are a variety of dietary supplements in the market containing carbohydrates, proteins, fats, minerals and vitamins. The source of protein is often soy, casein or whey. Flavors are added to make them tasty. These dietary supplements are available as energy drinks or energy bars. Energy bars offering primarily proteins are also available. Pure Protein Bar is also available in the market. These have more protein than other ingredients. Protein bars come in a variety of mouth watering flavors.

Besides protein, they are also rich in calories. Proteins enter into the body system along with other nutrients.

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