First, the good news: You probably won't get cancer. That is, if you have a healthy lifestyle. "As many as 70 percent of known causes of cancers are avoidable and related to lifestyle," says Thomas A. Sellers, PhD, associate director for cancer prevention and control at Moffitt Cancer Center in Tampa. Diet, exercise, and avoidance of tobacco products are, of course, your first line of defense, but recent research has uncovered many small, surprising ways you can weave even more disease prevention into your everyday life. Try these novel strategies and your risk could dwindle even more.

1. Filter Your Tap Water

You'll reduce your exposure to known or suspected carcinogens and hormone-disrupting chemicals. A new report from the President's Cancer Panel on how to reduce exposure to carcinogens suggests that home-filtered tap water is a safer bet than bottled water, whose quality often is not higher—and in some cases is worse—than that of municipal sources, according to a study by the Environmental Working Group. (Consumer Reports' top picks for faucet-mounted filters: Culligan, Pur Vertical, and the Brita OPFF-100.) Store water in stainless steel or glass to avoid chemical contaminants such as BPA that can leach from plastic bottles.

2. Stop Topping Your Tank

So say the EPA and the President's Cancer Panel: Pumping one last squirt of gas into your car after the nozzle clicks off can spill fuel and foil the pump's vapor recovery system, designed to keep toxic chemicals such as cancer-causing benzene out of the air, where they can come in contact with your skin or get into your lungs.

3. Marinate Meat Before Grilling

Processed, charred, and well-done meats can contain cancer-causing heterocyclic amines, which form when meat is seared at high temperatures, and polycyclic aromatic hydrocarbons, which get into food when it's charcoal broiled. "The recommendation to cut down on grilled meat has really solid scientific evidence behind it," says Cheryl Lyn Walker, PhD, a professor of carcinogenesis at the University of Texas M.D. Anderson Cancer Center. If you do grill, add rosemary and thyme to your favorite marinade and soak meat for at least an hour before cooking. The antioxidant-rich spices can cut HCAs by as much as 87 percent, according to research at Kansas State University.

4. Caffeinate Every Day

Java lovers who drank 5 or more cups of caffeinated coffee a day had a 40 percent decreased risk of brain cancer, compared with people who drank the least in a 2010 British study. A 5-cup-a-day coffee habit reduces risks of cancers of the pharynx and mouth almost as much. Researchers credit the caffeine: Decaf had no comparable effect. But coffee was a more potent protector against these cancers than tea, which the British researchers said also offered protection against brain cancer.

5. Water Down Your Risks

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 f lush them through the bladder faster. Drink at least 8 cups of liquid a day, suggests the American Cancer Society.

6. Load Up On Really Green Greens

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. "Magnesium affects signaling in cells, and without the right amount, cells may do things like divide and replicate when they shouldn't," says Walker. Just ½ cup of cooked spinach provides 75 mg of magnesium, 20 percent of the daily value.

7. Snack On Brazil Nuts

They're a stellar source of selenium, an antioxidant that lowers the risk of bladder cancer in women, according to research from Dartmouth Medical School. Other studies have found that people with high blood levels of selenium have lower rates of dying of lung and colorectal cancers. Researchers think selenium not only protects cells from free radical damage but may enhance immune function and suppress formation of blood vessels that nourish tumors.

8. Burn Off This Breast Cancer Risk Factor

Moderate exercise such as brisk walking 2 hours a week cuts risk of breast cancer 18 percent. Regular workouts may lower your risks by helping you burn fat, which otherwise produces its own estrogen, a known contributor to cancer.

9. Ask Your Doc About Breast Density

Women whose mammograms have revealed breast density readings of 75 percent or more have a cancer risk 4 to 5 times higher than that of women with low density scores, according to recent research. One theory is that denser breasts result from higher levels of estrogen—making exercise particularly important (see previous item). "Shrinking your body fat also changes growth factors, signaling proteins such as adipokines and hormones like insulin in ways that tend to turn off cancer-promoting processes in cells," Walker says.

10. Skip The Dry Cleaner

A solvent known as perc (short for perchloroethylene) that's used in traditional dry cleaning may cause liver and kidney cancers and leukemia, according to an EPA finding backed in early 2010 by the National Academies of Science. The main dangers are to workers who handle chemicals or treated clothes using older machines, although experts have not concluded that consumers are also at increased cancer risk. Less toxic alternatives: Hand-wash clothes with mild soap and air-dry them, spot cleaning if necessary with white vinegar.

11. Head Off Cell Phone Risks

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.

12. Block The Sun With Color

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 University of North Carolina at Chapel Hill researchers 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.

13. Eat Clean Foods

The President's Cancer Panel recommends buying meat free of antibiotics and added hormones, which are suspected of causing endocrine problems, including cancer. The report also advises that you purchase produce grown without pesticides or wash conventionally grown food thoroughly to remove residues. (The foods with the most pesticides: celery, peaches, strawberries, apples, and blueberries.) "At least 40 known carcinogens are found in pesticides and we should absolutely try to reduce exposure," Sellers says.