what is proteins and how it enable to be fit
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protien is mineral.this is very essential for body building.
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Proteins are essential nutrients for the human body.They are one of the building blocks of body tissue and can also serve as a fuel source. As a fuel, proteins provide as much energy density as carbohydrates: 4 kcal per gram; in contrast, lipids provide 9 kcal per gram. The most important aspect and defining characteristic of protein from a nutritional standpoint is its amino acid composition.
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