The best answer is that the diet of the elderly should be moderate and taboo. This is based on the metabolic characteristics of the elderly, reasonable diet, nourishing the five internal organs, invigorating qi and nourishing blood, and achieving the purpose of prolonging life. Old people who should eat less meat for a long time are prone to hypertension, atherosclerosis, coronary heart disease, hyperlipidemia, diabetes and other diseases. Therefore, the elderly should avoid big meat in their diet and eat more vegetables and fruits. Give priority to vegetarianism, eat less meat, pay attention to the collocation of vegetarianism, and meet the human body's demand for various nutrients. Ancient health experts once advocated: "Five grains are nourishing, five animals are beneficial, five vegetables are supplementing, and five fruits are helping", indicating that different nutrients can complement each other in the body. Proper freshness and avoiding off-flavor refer to the quality of food. Fresh food contains a variety of nutrients and tastes delicious, which can not only induce the appetite of the elderly, but also help digestion and absorption. Old people should avoid all bad food and half-dead turtles and crabs in their diet, because their immunity is weakened and the detoxification function of the liver is reduced. It is advisable to avoid the decline of gastrointestinal digestive function in the elderly. Eating too much can easily cause gastrointestinal burden, belching, abdominal distension, diarrhea and other symptoms. Full meals can damage brain function and promote aging. The ancients said, "I eat a small amount and don't want to eat more." The elderly should implement the principle of eating less and eating more meals according to their own physique, activity and calorie consumption. Old people who should be soft and avoid hardness, because of weak kidney qi and weak teeth, will slow down gastrointestinal peristalsis and reduce digestive juice secretion. In diet, it is better to be soft, and do not eat fried or baked food. In food cooking, steaming, boiling, stewing and stewing are the main ways to help digestion and absorption. It is best for the elderly to eat porridge, especially breakfast, which is beneficial to nourishing the stomach. Old people's appetite decreases, so in the cooking and processing of food, besides paying attention to color, fragrance and taste, salt should also be avoided. Eating too salty will cause excess sodium ions in the human body, cause vasoconstriction, raise blood pressure and cause cerebrovascular disorders. Old people should strictly control the amount of salt, about 3 grams per person per day. In diet, the elderly should also avoid foods that are too sweet and spicy to prevent obesity or gastrointestinal irritation. Most elderly people who should keep warm and avoid the cold belong to the body of deficiency cold, so they generally feel afraid of the cold every winter, and their limbs are tepid. I like to eat overheated food, which causes mechanical stimulation to esophagus and stomach, and is in danger of inducing esophageal cancer and gastric cancer. In late autumn and early winter, it is advisable to choose food and medicated diet with warming effect to maintain vitality. Eat less cold food, especially cold drinks, in hot days to avoid diseases such as indigestion, abdominal pain and diarrhea caused by damage to the spleen and stomach. Sun Simiao put forward a method to measure the inter-cooling temperature: "Heat has no burning lips, and cold has no ice teeth." Chinese medicine believes that cold food should be avoided in the syndrome of yang deficiency and cold; For the syndrome of yin deficiency and heat excess, hot food such as spicy tobacco and alcohol should be avoided. Tea is the best drink with rich nutrition. Drinking tea in moderation for the elderly can supplement essential nutrients such as vitamins, folic acid and nicotinic acid. Drinking tea can refresh the mind, improve gastrointestinal function, and prevent and treat hypertension, coronary heart disease, dental caries and cancer. Drinking alcohol in the elderly does more harm than good. Alcohol can damage human tissues and organs, reduce intelligence and aggravate dementia symptoms. Long-term alcoholism can lead to stomach and lung bleeding and cirrhosis, and even develop into liver cancer.