There is no guaranteed way to prevent all types of cancer, but there are several measures you can take to reduce your risk. Here are some suggestions: 1. Avoid tobacco: The most important preventive measure is to avoid all forms of tobacco, including cigarettes, cigars, pipes, and smokeless tobacco. If you smoke, seek help to quit, and avoid exposure to secondhand smoke. 2. Eat a healthy diet: Consume a balanced diet rich in fruits, vegetables, whole grains, and lean proteins. Limit your intake of processed and red meats, as well as sugary and processed foods.