From birth to old age, people’s personality, appearance and physiology are constantly changing, and their physiological functions are gradually maturing from early childhood to youth, until middle age, when their physical strength declines and their functions decrease year by year, and all parts of the body tend to age and enter old age. Nowadays, 60-65 years old is the starting age of old age, and there are corresponding changes from appearance to metabolism, physiology and organ function, and the composition of the body is also changing slowly. This change can be accelerated or slowed down by diseases and environmental factors. Now from a worldwide perspective, the number of people over 60 years old has reached 600 million and is growing at a rate of more than 1 million per month, which will increase to 2 billion by 2050, with a greater increase in the aging population in developing countries. China is one of the fastest growing aging countries in the world, and by 2015, the number of people over 60 years old will exceed 200 million. Therefore, it is hoped that society, families and various elderly undertakings will make more efforts in strengthening physical and psychological health care and prevention for the elderly, so as to reduce the harm of various chronic non-communicable diseases, delay the process of aging of physiological functions and reduce the medical burden on the whole society. Nutrition and health education for the elderly should also keep pace with the rapid aging of the population. It is often said that “it is hard to buy a thin old man”, and excessive body fat in the elderly will increase health risks. Some diseases such as arteriosclerosis, hypertension, coronary heart disease, gallbladder disease, diabetes, breast cancer, etc. are closely related to obesity. But “it is hard to buy a thin old man” is not the thinner the better, in old age to maintain the appropriate weight, do not develop into obese. The elderly body too thin, physical decline, for health and longevity is also not good. Based on advanced scientific evidence, the Chinese Nutrition Society has provided the most basic and scientific nutritional dietary information for the whole population, “Dietary Guidelines for Chinese Residents”, in which 10 principles and their explanations are applicable to the elderly, and 4 more articles have been added due to the characteristics of the elderly themselves as one of the specific groups. The 10 principles and their explanations are all applicable to the elderly, and four additional principles have been added due to the characteristics of the elderly as a group of people, as follows: 1. 9, such as drinking alcohol should be limited; 10, eat fresh and hygienic food; 11, food should be coarse and fine, soft, easy to digest and absorb; 12, reasonable dietary arrangements to improve the quality of life; 13, pay attention to the prevention of malnutrition and anemia; 14, do more outdoor activities to maintain a healthy weight. According to the above principles, it is necessary for the elderly to make appropriate adjustments to their dietary arrangements, food choices and cooking methods, and they need to be taken care of and strengthen self-care in their family life. There are also many famous health quotes and useful folk rhymes in the longevity hometowns around the world, such as “breakfast should be good, lunch should be full, dinner should be small”, “eat more vegetables and less meat, coarse rice and light rice can lead to longevity”, “one less bite of night meal can lead to 99 “. “Fish produces fire, meat produces phlegm, vegetables and radishes keep peace” and so on are also good explanations for these suggestions. The need for protein in the elderly is not lower than that of adults, so in the case of reduced food intake, attention should be paid to supplementing high-quality protein, i.e. animal protein and legume protein. Every day, the elderly should basically ensure one or two each of lean meat and fish, half a pound of low-fat milk, one egg and half a pound of soy products. Fat is one of the important nutrients, but since excessive fat intake is associated with age-related diseases, the intake should be limited to 20% of the total energy, and the intake of animal fat should be reduced. In addition to the fat in food, cooking oil should not be more than 20-25 grams per day, equivalent to 2 tablespoons, and it is best to use a variety of vegetable oils alternately. Cereals and potatoes can provide energy, protein, dietary fiber, minerals and B vitamins, the elderly should choose a variety of cereals, four or two to half a pound of staple foods per day, including two or two coarse grains. Most vitamins cannot be synthesized in the body or stored in large quantities in tissues and must be provided by food regularly. Older people have a relatively higher need for various vitamins due to lower metabolism and immune function, at least as much as adults, but the amount of food consumed decreases accordingly, so more attention should be paid to eating vitamin-rich foods or supplementing with vitamin supplements in moderation. So you should also use fine soft vegetables half a pound to a pound, one fruit, a small amount of mushrooms and algae (such as mushrooms, fungus, seaweed, nori, etc.). The elderly often loose teeth missing, chewing function is not good, digestion and absorption function is reduced, poor appetite, dishes should be prepared to pay attention to both easy to digest, but also to maximize the preservation of the original nutrients in the food and its color, aroma, taste, in order to improve appetite. The dishes should be finely chopped, cooked lightly with less salt, steamed, boiled, stewed and fried, and less fried, fried, baked and pickled food. Meals should be arranged in a small number of meals, and two snacks can be arranged between three meals a day according to our traditional customs. Three meals are regular and quantitative. Avoid spicy and irritating foods. There is no shortage of centenarians in ancient and modern times. Sun Simiao, a famous doctor in the Tang Dynasty, wrote the “Thousand Gold Essentials” at the age of 70, and the “Thousand Gold Wing” at the age of 100, which has been passed down to this day as a world medical masterpiece. After he turned 100, he was still enthusiastic about treating others. He continued to be an enthusiastic doctor until his death at the age of 142. At the age of 80-90, Prof. Zheng Ji, the founder of contemporary nutrition in China, the predecessor of biochemistry, and the founder of aging and anti-aging research, has authored and published seven monographs, including three award-winning ones. He published 56 scientific papers, supervised 9 master’s and doctoral students, and trained more than 10 teachers; he worked every day before he turned 100, and after he turned 100, he had to work 4-5 hours a day at home because his health did not allow it. At the age of 110, Mr. Zheng still has quick talents and humorous talk, successfully proving that human beings can live a long and healthy life. After more than 80 years of working on nutrition education and research, he became the world’s longest-lived professor and died in August 2010. Paying attention to a balanced, hygienic and disciplined diet and reasonable exercise are common features and health experiences of long-lived elderly people. This article is to commemorate Zheng Ji, and to wish the world’s elderly a peaceful and prosperous old age!