蛋白质确实有优劣之分。区分其优劣是根据蛋白质含有的氨基酸种类的多寡决定的。蛋白质是由氨基酸构成的,迄今为止共发现了20种氨基酸,它们的不同组合形成了数以万计种的蛋白质。研究证实,人类的饮食中有8种氨基酸是必不可少的,被称为必需氨基酸。如果在膳食中缺少它们,人就会出现生长发育迟缓、贫血、毛发枯黄等症状。另 Protein does have advantages and disadvantages. Distinguish between its advantages and disadvantages is based on the type of protein contained in the number of amino acids determined. Protein is composed of amino acids, so far found a total of 20 kinds of amino acids, their different combinations formed tens of thousands of kinds of protein. Studies have confirmed that eight kinds of amino acids in human diet are essential, known as essential amino acids. If the lack of them in the diet, people will appear growth retardation, anemia, hair yellow and other symptoms. another