Use your cell phone only for short calls or texts, or use a hands-free device that keeps the phone—and the radio frequency energy it emits—away from your head. The point is more to preempt any risk than to protect against a proven danger: Evidence that cell phones increase brain cancer risk is neither consistent nor conclusive, says the President's Cancer Panel report. But a number of review studies suggest there's a link.
Choosing your outdoor outfit wisely may help protect against skin cancer, say Spanish scientists. In their research, blue and red fabrics offered significantly better protection against the sun's UV rays than white and yellow ones did. Don't forget to put on a hat: Though melanoma can appear anywhere on the body, it's more common in areas the sun hits, and researchers at the University of North Carolina at Chapel Hill have found that people with melanomas on the scalp or neck die at almost twice the rate of people with the cancer on other areas of the body.
Moderate exercise such as brisk walking 2 hours a week cuts risk of breast cancer 18%. Regular workouts may lower your risks by helping you burn fat, which otherwise produces its own estrogen, a known contributor to breast cancer.
Next time you're choosing salad fixings, reach for the darkest varieties. The chlorophyll that gives them their color is loaded with magnesium, which some large studies have found lowers the risk of colon cancer in women.
Drinking plenty of water and other liquids may reduce the risk of bladder cancer by diluting the concentration of cancer-causing agents in urine and helping to flush them through the bladder faster. Drink at least 8 cups of liquid a day, suggests the American Cancer Society.