Everyone can get cancer because we have a “proto-oncogene” in our body, which may be activated by external stimuli. This external factor often comes from our life. According to a report published by the International Union Against Cancer, there are 12 million new cancer cases in the world every year, and up to 40% of them could have been prevented in life. Compared with the high cost of cancer treatment, the following 10 kinds of cancer prevention prescriptions are the cheapest in the world. 1. Drinking soy milk can prevent “female cancer”. According to the American Association for Cancer Research, women who drink soy milk regularly have a much lower risk of breast cancer. This is because there is a substance in soy milk that is very much like estrogen, called “soy isoflavones”, which can play a role in disguising the real thing and is very similar to the mechanism of anti-cancer drugs. It has a preventive effect on all estrogen-related cancers, such as breast, endometrial, cervical and prostate cancers. People who are already suffering from these cancers are advised not to drink soy milk to avoid stimulation of cancer cells. In addition, people suffering from peptic ulcers, gastritis, and gout should also drink less. It is best to drink your own ground soya bean milk, many of those sold on the street are brewed with soya bean milk powder, the content of soy isoflavones is very low. 2. Walk for 1 hour every day. A 30-minute walk every day after a meal, or a four-hour walk every week, can reduce the risk of pancreatic cancer by half. 3. Drink 6 glasses of water a day. Studies show that men who drink six glasses of water a day (240 grams per glass) will have half the risk of bladder cancer and women will have 45% less risk of colon cancer. This is because drinking water can increase the number of urination and defecation, which may stimulate the bladder mucosa, colon harmful substances, such as urea, uric acid, etc. out of the body. 4. 15 minutes of sunshine. In the cheapest prescription for cancer prevention, sunbathing is the best way to prevent cancer by increasing the content of vitamin D in the body without any expense. 5.Four cups of green tea every day. Tea-loving Japanese people have spent nine years to do a survey, found that as long as four or five cups of tea a day, you can reduce the risk of cancer by 40 percent. Oolong tea, green tea, black tea on oral cancer, lung cancer, esophageal cancer, liver cancer, etc. have a good preventive effect. Among them, green tea, including Longjing, Biluochun and Mao Feng, is the most effective, with five times more cancer prevention ingredients than other teas. However, it is best not to drink tea that is too strong and too hot, otherwise it will affect its anti-cancer effect. The best tea drinking temperature should be about 60 degrees Celsius, and the tea should be steeped for 5 minutes before the active ingredients can be dissolved in the water. 6.Open the window for at least half an hour. Few people know that besides formaldehyde, decoration pollution also has a very strong carcinogenic gas – radon and its daughter. It is usually hidden in granite, cement and tiles, and spreads indoors along the cracks in these places and enters human body through respiratory tract, which will induce lung cancer after a long time. In fact, as long as the windows are opened for half an hour every day, the concentration of radon can be reduced to the same as outdoor. In addition, radon will also be produced after natural gas burning, so when boiling water in the kitchen, it is better to open the window and close the door connected with the living room. 7.Wipe your back with a dry towel. For middle-aged and elderly people, whether rubbing, rubbing or scratching the back is a good health care method. Or use the ends of a dry towel, straight, horizontal repeatedly rub the entire back for about 10 minutes until the skin is red and hot. 8, a bite of rice chewed 30 times. A survey has proved that people who always swallow their meals in one go have a higher chance of stomach cancer. Chewing more can reduce the burden of food on the digestive tract and lower the risk of gastrointestinal cancer. 9.Sleep enough for 7 hours. The American Association for Cancer Research found that women who sleep less than 7 hours a night have a 47% higher chance of developing breast cancer. This is because sleep produces a melatonin, which slows down the production of estrogen in women’s bodies, thus inhibiting the purpose of breast cancer. 10. Drink a glass of red wine while eating meat. The grape skins used to make red wine contain a substance called resveratrol, which has a preventive effect on digestive tract cancers.