80% of tumors are caused by poor lifestyle and environmental factors, and 50% of cancers are related to dietary structure and safety problems of food itself. The seemingly simple three meals a day not only provide energy for life, but also lurk the mystery of life. Half of cancers are caused by eating 50% of cancers are caused by eating. This is the conclusion reached by scientists after social investigation and scientific analysis. More and more studies show that cancer is closely related to lifestyle, especially dietary habits, and if people can change their bad dietary habits, then 60-70% of cancers can be prevented. The word “cancer” has 3 “mouths” The fact that there are 3 “mouths” in the word “cancer” shows the close relationship between cancer and poor diet. This shows the close relationship between cancer and poor diet. Long-term irregular diet will lead to esophageal movement and coordination disorders, and cause damage to the esophagus. The speed of eating is too fast and food is not fully chewed, which is not conducive to the initial digestion of food and salivary amylase in the mouth and increases the burden on the stomach and intestines. In addition, some people like to eat while it is hot, thinking that it is very fragrant, not knowing that the delicate esophageal mucosa cannot withstand such “deep and hot” test, which can easily cause esophageal inflammation, and over time, esophageal cancer may occur. Modern people consume too much fine food and not enough dietary fiber. Dietary fiber cannot be digested and utilized by human body, but in the intestine, it can increase intestinal peristalsis and avoid stool accumulation. The prolonged passage time of stool through the intestine can increase the chance of carcinogenic substances coming into contact with the intestine and become one of the risk factors of colorectal cancer. The International Union Against Cancer points out that most of the causes of cancer are environmental factors, and dietary nutrition is the most important environmental factor besides smoking. Yu said that cancer can be prevented and controlled by eating a poor diet, but also by eating a balanced diet and eating healthily. Among the relationship between diet, nutrition and cancer, only vegetables and fruits have the most convincing protective effect. Plant foods should be allowed to take up more than 2/3 of daily meals, and cancer prevention cannot rely on nutrients, but on food. Chemicals in food can affect genes and genomic expression, which can be avoided with a balanced diet, and by accepting a balanced dietary structure, certain genetic traits can be converted to health. “There is no near work in the kingdom of moistening.” The role of balanced diet is valuable in daily adherence. Eight sentences guide balanced diet The balanced diet guide recommended by Chinese Nutrition Society has eight sentences: diverse food, cereals are the main; more vegetables, fruits and vegetables are complementary; milk and beans, always have about; moderate and often eat, fish, poultry, eggs and meat; frequent exercise, eating moderately; light and less salt, less fatty meat; if drinking, should be more limited; diet hygiene, prevent disease and benefit life. Yu said, only in this way, will not be prepared for cancer “paving stone”. The daily food should consist of cereals, meat and eggs, soybeans, apples and fats. However, the amount of fat intake should not be too much. It is important to match coarse and fine, meat and vegetable, dry and thin, with a daily food intake of about 25-30 kinds, and advocate more coarse grains to increase dietary fiber. There should be enough vegetables and fruits in the daily diet, especially those rich in carotene and vitamin C. The daily intake of vegetables and fruits should be more than 500 grams; they should be eaten now to prevent the loss of vitamins. In addition, a balanced diet also lies in maintaining a stable and healthy body weight. Too high or too low body weight is an unhealthy performance. Because the amount of food and physical activity are the two main factors to maintain a suitable weight. If the amount of food is too much and the amount of activity is not enough, the extra calories will accumulate in the body in the form of fat, which will increase the weight and make you fat in the long run. Therefore, people need to maintain a balance between the amount of food and calorie consumption. Supplemental nutrition, from natural Natural food contains nutrients to the body’s nutritional effect is stronger than synthetic processed nutrients. One study found that people who ate large amounts of natural fruits and vegetables led to a significant decrease in the incidence of certain cancers. However, when nutrients that have cancer-inhibiting effects are isolated from vegetables and fruits and then applied to the human body, the effects are lost. Obviously, these nutrients are not suitable for “stand-alone”, it needs the support of the whole team. In addition, the nutrients in natural food are basically non-toxic and harmless to the body, and not easy to supplement in excess. The use of purified drugs is prone to problems, such as selenium in the prevention and treatment of cancer has a certain efficacy, but if the patients do not lack of selenium blindly selenium supplementation, there is a certain danger, because the effective dose of selenium and poisoning dose is very close. The most scientific, safe and economical way to replenish the body’s nutritional needs is to get it from natural foods. “Gutter oil” and moldy food should never be eaten. For cancer prevention, clean diet is very important, for example, “gutter oil” is very carcinogenic because it contains a large amount of aflatoxin, a strong carcinogen. Mycotoxins are metabolites produced by natural conditions caused by the growth of mold in food, and are highly carcinogenic. Such as aflatoxin can contaminate food and oil and its products, so there is moldy peanuts, peanut oil, corn, rice, etc. can not be eaten. Epidemiological investigation found that these moldy food and liver cancer development. For fish, meat and eggs advocate low-temperature storage in the refrigerator to prevent mold. Less smoked and fried food Because of burnt, baked, smoked and fried food in the processing, under the condition of water loss, protein can be generated under the effect of high temperature heating carcinogenic pyrolytes. The normal cooking, not burnt food, there is not necessarily such carcinogenic substances. There are also direct grilled meat with charcoal fire, and the polycyclic aromatic hydrocarbons (carcinogens) generated by the fat drops in the meat on the fire can easily contaminate the food surface and cause cancer after eating; pickled products, such as salt-cured dried fish, contain nitroso compounds; nitroso compounds can also be found in fermented foods such as sauerkraut and beer, and research has proved that nitroso compounds are a large class of carcinogens. In daily life, we should minimize the consumption of pickles and pickled vegetables, salted fish and other pickled products, perishable protein-rich fish, meat, shellfish and vegetables containing nitrite, such as beets, spinach, celery, cabbage, cauliflower, radish, lettuce, etc. Try to store at low temperature to reduce the intake of amines and nitrite. When cooking and processing, fish and meat as far as possible with steam, boiled, stewed as good. Eat more fresh vegetables and fruits to prevent the formation of nitroso compounds in the body. Eat less processed meat products Processed meat products are often cured, smoked or have nitrates added to them to extend their shelf life, which leads to an increase in the incidence of stomach cancer. It has been reported that people with higher intake of red meat (mainly beef, lamb and pork) and processed meat also have higher risk of colorectal cancer. Enemas, sausages, hams and cooked meats sold in supermarkets are bright red in color and look very good, but those red substances are nitrates. After combining with hemoglobin, nitrate is not afraid of heating, but it is still red after heating, but it may be combined with protein in meat to synthesize nitrosamines. Also, eating too many processed meats such as sausages and hot dogs can increase the probability of pancreatic cancer.