Acid-base: Food is divided into acid and alkaline, including general grains (rice, flour, corn, etc.). ), meat (pigs, cattle, sheep, etc. ), poultry (chicken, duck, goose, etc. ), aquatic products (fish, shrimp, shellfish, etc. ), eggs, peanuts, walnuts, sugar, wine brewed from five grains, etc. , and contains phosphorus and sulfur. Vegetables, fruits, milk, sweet potatoes, potatoes, kelp, beans, mushrooms, cucumbers, etc. It contains more elements such as potassium, calcium, sodium and magnesium, and belongs to alkaline food. Acidic and alkaline foods will bring acidic or alkaline tendencies to human blood and body fluids respectively. In a healthy state, human body fluids are generally weakly alkaline. Eating too much acidic food will affect the absorption of nutrients and form an acidic constitution, which is easy to get sick; Eating too much alkaline food will make the body liquid alkaline, which is not good for the body. Pay attention to the proper collocation of two foods in daily diet, and strive for acid-base balance.

Cold and heat: from the perspective of Chinese medicine, food can be used as medicine, with cold, cool, warm, hot and other properties. Because the constitution should be in harmony with Yin and Yang, the daily diet should be targeted to eat more or less certain foods, so that Yin and Yang Can can be in harmony, which is the foundation of health. Some patients should pay more attention to the coldness and warmth of food. Proper taboos are more conducive to the treatment of diseases. For example, warm foods include chicken, taro, pumpkin, pepper, ginger, garlic, leek, glutinous rice, oranges, persimmons, plums and pomegranates. And mutton, dog meat, pepper, litchi, pineapple and so on. Cold foods include duck, pork, kelp, snail, bamboo shoots, cabbage, eggplant, bitter gourd, banana and so on. Cold foods include black beans, cucumbers, mustard greens, pears, peaches and grapefruit. Flat foods include eggs, sugar, tomatoes, sweet potatoes, corn, lotus roots, apples and so on. Pay attention to the reasonable collocation of different food attributes to maintain the harmony of yin and yang in the body. People with deficiency-cold constitution should not eat more warm food, but also choose partial eclipse according to the climate.

Fine and coarse: Modern people eat more and more fine, and coarse food and omnivorous food have become hot in recent years. Fine-crafted food has been processed into unnatural food, which is not good for health; However, refined food loses a lot of nutrients in the process of processing, which easily leads to unbalanced nutrition and malnutrition under high living standards. Therefore, it is necessary to change the bad eating habits of "eating fine but not greasy" and match the thickness of staple food to ensure adequate nutrition.

Fat and thin: In the past, people liked to eat fat to ensure enough fat. After living a good life, people are afraid that too much fat will produce obesity or too much cholesterol, and they are prone to cerebrovascular diseases, coronary heart disease and arteriosclerosis. In fact, fat plays an important role in human energy metabolism. The cholesterol content in fat meat is per100g 107 mg, which is much lower than that of egg yolk, dried shrimps and fish eggs, but it contains vitamins A and D, so you should eat both fat and thin. Especially young people who are developing, eating some fat meat is more conducive to their growth. People generally like to eat vegetable oil, so they should eat fat in moderation, so that some animal oils can play a role in regulating nutrition.

Soft and hard: the food is soft and hard, and the rice is dry and thin. Children should eat more hard food, which is conducive to tooth growth; Old people's physical fitness declines, so they should eat more soft food and accelerate the absorption of nutrients. Patients with gastrointestinal diseases should not eat too hard and dry food often, which will increase the burden on the stomach and induce the recurrence or aggravation of the disease. Young people often eat hard food to maintain good chewing function. Therefore, you can eat more soft food in your life to ensure the full absorption of nutrients. It is best to mix hard and soft, and focus on it.

Salty and light: salt helps to maintain normal blood volume of human body and control the circulation of water inside and outside human cells. Eating too little salt will affect human health, but eating too much salt has been proved to be related to the high incidence of hypertension and heart disease. At present, people's salt intake is generally too high, so it is necessary to control the salt intake properly. The daily salt intake of normal adults should be between 5 and 6 grams, which is equivalent to the salt content of 15 to 35 grams of soy sauce.

Sweet with bitterness: eating sweets often can replenish qi and blood, which helps to relieve muscle tension and detoxify; However, eating too many sweets will lead to an increase in blood sugar and cholesterol in the blood, making the body bloated. Eating too much sugar for teenagers will affect nutrient absorption and cause malnutrition, so 8 kilograms of sugar per person per year is enough. Bitter food contains amino acids, vitamins, alkaloids, glycosides, bittersweet, trace elements and so on. Has antibacterial, antiinflammatory, antipyretic, summer-heat relieving, digestion promoting, appetite stimulating, and fatigue relieving effects. Studies have found that bitter food has the function of anti-cancer and lowering blood sugar, and more "asking for it" can get the benefit of "bitter conscience".

Vegetarian: Meat is also meat. Eating too much meat has brought many physical discomforts and diseases to modern people, such as elevated cholesterol, cardiovascular diseases, hypertension and obesity. So people, especially abroad, have started to be vegetarian. Indeed, too much vegetarian food has a negative impact on health. Eating more vegetarian food will promote acid-base balance, prevent cardiovascular diseases and avoid obesity, and also beautify the face, but long-term vegetarian food will do more harm than good. Vegetarian food will make protein not fully supplied, and some digestive functions of human body will gradually decline, leading to material exchange obstacles, which will lead to memory loss, listlessness and slow response. Long-term protein deficiency is also an important cause of digestive tract tumors and gastric cancer. It is recommended to be vegetarian every Monday or every day.

Fast and slow: with the acceleration of social rhythm, "fast food" came into being and was greatly favored. However, there are many problems in fast food, such as too many chemical additives, incomplete nutrition and poor sanitary conditions, which are contrary to traditional food culture and eating habits. At present, the "slow food" movement is rising abroad, taking the protection of the food culture formed in history as its own responsibility, recommending colorful traditional cooking methods, advocating eating slowly during meals, helping digestion, protecting the stomach, pancreas, gallbladder and other organs from strong stimulation, and reducing postprandial hyperglycemia.

Hunger and satiety: when people are hungry, they have to eat. Modern people live a superior life, and some people take eating delicious food as their first choice. Diet causes many diseases. So, should people be full or hungry? Neijing says that "eating twice as much will hurt the stomach" and "moderate diet" is one of the important conditions for "not leaving for a hundred years". Sun Simiao said: "I don't want to eat in extreme hunger, but I don't have enough to eat;" I don't want to drink too much when I am extremely thirsty. "Modern people's scientific concept of diet should be' where there is food, there is no hunger and no fullness', that is, you can't always be hungry and full. Long-term hunger will reduce the detoxification ability of human liver, while a large amount of high-protein food intake in a short period of time will exceed the ability of liver and kidney to process ammonia, leading to ammonia poisoning and poisoning the central nervous system, so it is best to eat a good breakfast, have a full lunch, have a small dinner and feel hungry. Relevant medical research also shows that people who are hungry for a meal or a day can also make the human body empty, which is conducive to eliminating waste and impurities in the body, enhancing human immune function and improving the body's metabolism.