 30% of cancer deaths and almost 20% 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.