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人体是由各种有机分子与无机物的化学成分组成的,这主要是水、蛋白质、脂肪、碳水化合物、维生素、盐类和一些其它的生物活性物质。人体的内环境通过上述物质的不断新陈代谢而保持相对恒定。这些物质代谢的速度依内部和外部的许多条件为转移:如性别、年龄、职业活动、健康水平、气候(地理区域)、饮食习惯等等。食物是外都作用的因素,它进入体内转化为能量和人体的缩构成分。由于物质代谢的明显改变,人体对素自周围环境的无机和有机物(总称为食物)的要求也发生变化。食物进入人体过程的本身和消化吸收就被定义为营养。
The human body is made up of the chemical constituents of various organic and inorganic substances, mainly water, protein, fat, carbohydrates, vitamins, salts and some other bioactive substances. The internal environment of the body remains relatively constant through the constant metabolism of the above substances. The rate of metabolism of these substances shifts according to many internal and external conditions: gender, age, occupational activity, level of health, climate (geographical area), eating habits and so on. Food is outside the role of factors that enter the body into the energy and the body’s reduced components. The body’s requirements for inorganic and organic matter (collectively referred to as foods) that are derived from the surrounding environment also change as a result of significant changes in material metabolism. The process of food entering the body itself and digestion and absorption is defined as nutrition.