In addition, certain food constituents help protect against cancer. Dietary fiber, principally found in whole grain cereals and legumes, helps prevent cancer of the colon and rectum. It also appears to reduce risk of breast cancer, perhaps by lowering cholesterol and sex hormones. Avoiding excessive exposure to sunlight is a critical step in the prevention of skin cancer. In addition, radon, a natural radioactive gas that seeps up from certain underground rocks into groundwater supplies, has been implicated in certain cancers.
Improved ventilation stops radon from building up in enclosed areas.
Prevention is the light at the end of the tunnel for those looking for a way to reduce the cancer epidemic. By avoiding factors that lead to cancer and including foods that strengthen us against the disease, we can, to a great extent, control our own risk. Other factors may also play a role in certain forms of cancer and are not included in this table. Categories may overlap. For example, both tobacco and alcohol contribute to esophageal cancer.