Cancer prevention methods mainly include the following: 1. light diet: bowel cancer has a certain correlation with obesity; breast cancer has a certain correlation with high-fat diet; 2. quit smoking: lung cancer has a certain correlation with smoking, haze and other factors; 3. maintain a good mood: breast cancer has a certain correlation with emotional irritability and extreme depression; 4. moderate exercise: exercise can increase the body’s resistance and improve the body’s immunity, relieve the release of stress and prevent the occurrence of cancer.