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proteins contain----carbon, hydrogen, oxygen, nitrogen and sometimes sulphur.proteins are very large molecules, so they cannot be directly absorbed into our blood . So they are turned into amino acids by our digestive system. There are 23 amino acids. Out of these, 9 amino acids must be available in diet.
These amino acids are used by the body to create blood, muscles,nails,skin,hair and tissue internal organs. Proteins from new tissues,repair the broken tissues ,regulate balance of water and acids, transport oxygen qnd nutrients and make antibiotics. 
Excessive use of protiens in diet, especially animal protiens can result in heart diseases ,osteoporosis, stoke and kidney stones. 
Body requires only 0.36 grams of protien per pound of the ideal body weight. If protien are not taken in appropriate amount in diet, then we may suffer from deficiency diseases. Marasmus and kwashiorkor are protien deficiency disease in children.
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