Protein (nutrient)

（重定向自Protein requirement）

Amino acids are the building blocks of protein.

Amino acids are necessary nutrients. Present in every cell, they are also precursors to nucleic acids, co-enzymes, hormones, immune response, repair and other molecules essential for life.

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 contain 4 kcal (17 kJ) per gram, just like carbohydrates and unlike lipids, which contain 9 kcal (37 kJ) per gram. The most important aspect and defining characteristic of protein from a nutritional standpoint is its amino acid composition.

单词	Protein requirement
释义	Protein requirement 原声例句科学世界 The American Dietetic Association, or ADA, states that the protein from plants can easily meet and exceed protein requirements, and that being an omnivore merely increases the amount of protein sources a person can have by including animal meat. 美国饮食协会，又称 ADA，声明来自植物的蛋白质可以轻易满足和超出蛋白质需求，变杂食动物纯粹只是增加人的蛋白质来源量，藉由将肉类纳入饮食中。英语百科 Protein (nutrient) （重定向自Protein requirement） 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 contain 4 kcal (17 kJ) per gram, just like carbohydrates and unlike lipids, which contain 9 kcal (37 kJ) per gram. The most important aspect and defining characteristic of protein from a nutritional standpoint is its amino acid composition.
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