Proteins are the macro nutrients essential for building up the human body. They are called macro nutrients because they form the bulk of the food. Proteins play an important role in human  nutrition.

Proteins are organic nitrogenous substances essential for human body. The building blocks of protein are amino acids. About 20 amino acids are needed by the human body for growth. Of these 9 amino acids cannot be synthesized by the human body and should by the human body and should be supplied through diet.

The essential amino acids are methionine, threonine, tryptophan, valine, isoleucine, lysine, phenylalanine, histicline, leucine.

The rich sources of proteins are both animal and plant sources. The animal sources are egg, milk, meat, cheese, fish etc. The plant sources are cereals, pulses, beans etc.

Proteins constitute about 25% of the body weight of adults. Proteins are the building blocks of the body. They are the prime nutrients involved in bodybuilding. They also supplied energy. 1 gm of protein yields 4 kilocalories of energy. They are also essential for maintenance of structure and function of human body. They are essential for the synthesis of hemoglobin, enzymes, plasma proteins, antibodies, coagulation factors and soon.

Suga vanash is a writer and researcher for health-advice organization. He writes informative articles for hoodia weight loss subject. For more information on hoodia visit Hoodia Hair Essential oil