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人类的最大寿命值经科学推算,人约为120岁左右。由于中年期以后存活年龄延长,目前平均寿命接近80岁。一般认为,其后死因往往与营养是否合理密切相关。从百岁以上的超高龄老人的饮食生活调查,发现影响长寿的因素是多方面的。正确评价其中营养因素的作用程度是十分困难的,这是由于营养性疾病的发病通常都是长期的、慢性过程。故以人为对象进行长期实验研究,虽有很大的必要性,但毕竟少见。一般以哺乳动物为实验对象,因其体内代谢近似于人体,生物学寿命亦较短。实验动物多采用
The maximum life expectancy of human scientific projections, about 120 years old. As the median age of surviving after middle age is extended, the average life expectancy is now close to 80 years. It is generally believed that the subsequent cause of death is often closely related to whether nutrition is reasonable. From the survey of over 100-year-olds over the age of the elderly dietary life, found that factors that affect longevity are many. Correct evaluation of the role of nutritional factors is very difficult, this is because the incidence of nutritional diseases are usually long-term, chronic process. Therefore, long-term experimental study of human subjects, although a great necessity, but after all rare. Generally mammals as the experimental object, because of its approximate body metabolism, biological life expectancy is also shorter. More experimental animals to use