Medical scientists have confirmed through research that some cancers are completely preventable. To prevent cancer from happening, we must start with small things and do self-care. Sleep well: Australian experts point out that the climax of human cell metabolism is after sleep at night, if sleep is not good, it is difficult for the human body to control the cells from mutating and becoming cancer cells in the process. Laugh often: “A smile is a decade less”. Japanese experts have done experiments and found that after cancer patients have laughed, the active substances in the body that naturally kill cancer cells are greatly improved. Eat less: Eat less, but don’t overdo it. The principle is to eat enough but not too much and not full. No partiality: Partiality will cause malnutrition in human body, and due to the lack of some trace elements and vitamins, it reduces the immunity and cell stability of human body, which will easily induce cancer. Therefore, the diet should be diversified and the more kinds the better. Japanese scholars propose that more than 30 kinds of food should be eaten every day. Chew slowly: Saliva in the mouth is the first line of defense against carcinogens in human diet. Some people collected human saliva and then processed various carcinogenic substances through saliva and then acted with bacteria. It was found that bacterial mutations were reduced, even for the most carcinogenic aflatoxins, 3.4-benzopyrene and nitrite. Saliva can play a full role as long as 30 seconds after contact with food. Drink more tea: tea can inhibit nitrosamines from causing cancer, and also block the movement of carcinogenic nitrosamines in the body. Eat raw vegetables: raw vegetables contain phenols and quinones, which are two special ingredients. Quinones can dilute carcinogens and discharge carcinogens from the body in liquid form, while phenols can stop the metabolism and development of cancer cells, and the combination of the two can better fight cancer outside the body. Drink less alcohol: alcoholism or long-term consumption of strong alcohol is prone to oral cancer, stomach cancer and liver cancer. Do not smoke: Breathe fresh air, do not smoke, and do not go to smoky environment where there are smokers. Avoid exposure to sunlight: avoid sunlight, too much sunlight will induce skin cancer. Exercise often: Life is in exercise, and exercise can also prevent cancer. The main reason is that exercise improves the immune function of human body.