 percent of cancer deaths and almost 20 percent of cancer cases. Excess body weight was the second biggest with UV radiation and physical activity trailing behind it. The study author recommends a combination of behavioral choices and a wider emphasis on preventative health care. Cancer experts say the top five ways to reduce cancer risks are to stop smoking, maintain a healthy body weight, choose to eat healthier foods, eliminate alcohol intake, and get recommended screenings. The study was published in the journal CA, a cancer journal for clinicians.