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. |
