Protein is primitive substance of human nutrition. Protein comes from the
Greek "prota", meaning "of primary importance" and were first described and
named by J?ns Jakob Berzelius in 1838. Proteins are large organic compounds made
of amino acids arrange in a linear chain and joined together between the
carboxyl atom of amino acid and the amine nitrogen. Proteins are essential parts
of all living organisms and participate in every process within cell. Amino
acids are the basic structural building units of protein. Most amino acids occur
in two possible optical isomers, called D and L. The L-amino acids represent the
vast majority of amino acids found in proteins. D-amino acids are found in some
proteins produced by exotic sea-dwelling organisms, such as cone snails. There
are twenty standard amino acids which are encoded by the standard genetic code.
Some of the 20 standard proteinogenic amino acids are called essential amino
acids because human body cannot synthesize them from the other compounds through
chemical reaction. One way to get them is obtained from food. There are 10
essential amino acids. - Isoleucine: food sources of isoleucine are eggs,
chicken, pork, mutton, pulses, soy beans, cottage chess, milk, piyal seeds,
cashew nuts, and cereal grains. - Leucine: The most common amino acid found in
proteins. It also plays a part in maintaining muscles by equalizing synthesis
and breakdown proteins. Food sources of leucine are whole grains and milk
product, egg, pork, beef, chicken, pulses, soy beans, leafy vegetables - Lysine:
food sources of lysine are fish, soy beans - Methionine: Sulfur-containing
proteinogenic amino acid. Food sources of methionine are spinach, green peas,
garlic, cheeses, corn, brazil nuts, pistachios, cashew nuts, kidney beans,
chicken, beef, fish, vegetables, nuts, legumes - Phenylalanine: Food sources of
phenylalanine are dairy food (curd, milk, cottage cheese), avocados, pulses and
legumes, nuts, piyal seeds, leafy vegetables, whole grains, poultry, fish and
sea foods. - Threonine: Food sources of threonine are cottage cheese, poultry,
fish, meat, lentils, and sesame seeds. - Tryptophan: A precursor for serotonin,
melatonin and niacin. Food sources of tryptophan are oats, bananas, dried dates,
milk, yogurt, cottage cheese, meat, fish, poultry, sesame, chickpeas, peanuts. -
Valine: Food sources of valine are cottage cheese, fish, poultry, peanuts,
sesame seeds, lentils. - Arginine (essential only in certain cases): A
semiessential or conditionally essential amino acid , depending on the
developmental stage and health status of the individuals. Food sources of
arginine are chocolate, wheat germ and flour, buckwheat, granola, oatmeal, dairy
products, beef, pork, coconut, pecans, cashews, walnuts, almonds, Brazil nuts,
hazel nuts, peanuts, pumpkin seeds, sesame seeds, sunflower seeds, poultry,
pheasant, quail, seafood, soy beans. - Histidine (essential only in certain
cases): Food sources of histidine are grapes, meat, poultry, milk products, root
vegetables, green vegetables. Proteins are necessary for body builders because
main point of body building is lifting weight to rip muscles but don't make it
injure. Proteins which body builders consume go to renovate muscles from
ripping; remaining proteins go to increase muscles size. A sufficient protein
for body builder should be 1 - 1.5 grams per 1 pound of body weight per day. But
don't be confuse protein weight and food weight, because in one kind of food
there are many type of nutrition such as fat, carbohydrate, fiber and minerals.
A piece of beef separable lean and fat, trimmed to 0 inch fat weight 100 grams
contains with protein 30.5 grams, carbohydrate 0 gram, fat 9.4 grams and has 215
calories. A piece of chicken meat and skin weight 100 grams contains with
protein 22 grams, carbohydrate 10.3 grams, fat 21.9 grams and has 331 calories.
Protein that human consume will transform to amino acids. If human body cannot
absorb all of amino acids, amino acids cannot hold up in the body. Amino acids
will release to urine. Body builders who must consume more protein than another
people should calculate their sufficient protein for getting high useful protein
in each day. About the Author Weight training and body building blog
http://www-weighttraining.blogspot.com
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