Elderly people with normal gastrointestinal function, all kinds of nutrients still need to be obtained from three meals a day, scientific and reasonable diet can ensure that the nutritional intake of the comprehensive, adequate and balanced, can be appropriate supplementation of proteins, vitamins, fibers and so on. If the elderly have weak gastrointestinal function or underlying diseases, they need to take medicines (traditional Chinese medicine, western medicine) or formulas for special medical purposes under the guidance of a nutritionist to avoid adverse effects. Eggs, beans, fish, etc. are foods rich in high quality protein; vegetables and fruits are foods rich in vitamins; cereals and potatoes are foods rich in fiber. Elderly people can supplement the above foods appropriately in their daily life. If the elderly need to supplement nutrients, they should take them under the guidance of professional doctors to avoid adverse effects.