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人体从出生到成年,体重约增加20倍左右,身高约增长3～4倍。人体靠从食物中摄取多种营养物质来满足生长发育的需求,生长得越快,所需的营养物质也就越多。根据人体所需营养物质的不同,营养学专家将人体所需的营养物质分为7大类,即蛋白质、脂肪、碳水化合物、维生素、无机盐、水和食物纤维。在这7大类营养物质中,每个类别又分很多种。比如蛋白质是由20种基本氨基酸组合成的,这些氨基酸又分为必需氨基酸、非必需氨基酸和条件氨基酸。如果缺乏必需氨基酸,蛋白合成就会受限,不但影响发育,还会导致抵抗力下降,发生贫血和水肿。人体
The body from birth to adulthood, weight increased about 20 times, about 3 to 4 times the height increase. The human body depends on food intake of a variety of nutrients to meet the needs of growth and development, grow faster, the more nutrients required. According to the nutrients needed by the human body, nutrition experts divide the nutrients needed by the body into seven categories: protein, fat, carbohydrates, vitamins, inorganic salts, water and dietary fiber. In these seven categories of nutrients, each category is divided into many kinds. Such as protein is composed of 20 basic amino acids, these amino acids are divided into essential amino acids, non-essential amino acids and the conditions of amino acids. In the absence of essential amino acids, protein synthesis is limited, not only affect development, but also lead to decreased immunity, anemia and edema. human body