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一家人团聚吃饭,或是宴客,人们总会劝别人多吃点饭。当对方说够了,不吃了,主人还要说他“客气”,总要想点名目让别人再吃一点。人们大体上都有个想法:吃饭嘛,能多吃一点总是好的,只要他吃的下。其实不然。吃饭犹如机器加燃料。各种机器的运转,需要燃料来供给热能;人为了维持身体的正常生理机能,和从事各种不同的劳动,同样也需要热能。机器的热能来自燃料,人体所需要的热能全部是由食物得来的。一个人每天需要多少热能呢?这与年龄、性别、气候以及体力劳动的强度有密切的关系。其中体力劳动是最重要的因素,凡从事轻量体力劳动的人,如抄
Family reunion dinner, or banquet, people will always persuade others to eat more rice. When the other party said enough, do not eat, the owner also said he was “polite”, always want to point a name for others to eat more. People generally have an idea: Eat Well, it is always good to eat more, as long as he ate. actually not. Eating is like machine fueling. The operation of various machines requires fuel for the supply of heat; in order to maintain the normal physiological functions of the body and to perform various kinds of labor, man also needs heat energy. The heat from the machine comes from fuel, and all the heat the body needs is derived from food. How much heat a person needs per day? This is closely related to age, gender, climate, and intensity of manual labor. Among them, manual labor is the most important factor. All those who are engaged in light manual labor, such as copying