“饮食清淡”是长寿的重要因素之一。中老年人吃素可以长寿。中老年人的消化能力减弱,牙齿退化,油腻的东西吃多了,不易消化。中老年人不但胃肠功能减弱,心、肾的功能也不如青年时期,所以提倡食物清淡、少油腻和少糖盐。西方国家曾经提倡高蛋白、高脂肪、高热能饮食,结果是肥胖 “Light diet” is one of the important factors of longevity. Middle-aged and old vegetarian can longevity. The digestive capacity of the elderly weakened, tooth degeneration, greasy things to eat more, not digestible. In the elderly not only weakened gastrointestinal function, heart, kidney function is not as good as youth, so to promote light food, less greasy and less sugar salt. Western countries once advocated high protein, high fat, high calorie diet, the result is obesity