1, walk an hour a day Long-term studies have found that walking an hour a day can reduce the chances of colorectal cancer by half. 2, dry towel rubbing back For middle-aged and old people, no matter rubbing or scratching the back, it is a good health care method to prevent cancer. Hold both ends of a dry towel in your hands and rub the whole back repeatedly for about 10 minutes until the skin is red and hot. 3. Open the window for at least half an hour every day. Few people know that in addition to formaldehyde, there is also a strong carcinogenic gas — radon. As long as the window is open for half an hour every day, the concentration of radon can be reduced to the same level as outdoor. 4, often eat green onions and garlic A study shows that people who eat more green onions and garlic will reduce the risk of stomach cancer by 60%, which is related to the fact that green onions and garlic have antioxidant effects and can reduce the content of carcinogenic nitrite in the human body. 5, eat more chewing for a while more chewing can reduce the burden of food on the digestive tract, reduce the risk of gastrointestinal cancer. A mouthful of rice is best to chew 30 times, only with the role of cancer prevention. 6, sleep should be enough Sleep less than 7 hours of sleep per night women, the chances of breast cancer up to 47%, this is because sleep will produce melatonin, which can inhibit the production of breast cancer. In addition, half an hour of sleep at noon or take a nap, can enhance the activity of the body’s immune cells, play a certain role in cancer prevention.