Cancer: How to Lower and Cut Your Risk of Cancer

It's one of the world's leading causes of death, but about 1 in 3 cases can be prevented, according to the World Health Organization. There's no magic pill to keep you from getting cancer, but you can do some things to improve your odds.

Nearly 70% of Americans are overweight or obese -- and those extra pounds drive up your chances of several types of cancer, including in your esophagus, pancreas, colon, kidneys, and thyroid gland. With fewer people smoking, obesity may pass tobacco as the top preventable cause of cancer. If every adult in the U.S. cut their body mass index (a measure of your body fat) by 1%, it might cut the number of new cases by as many as 100,000.

Along with cured meats like bacon, hot dogs, and lunchmeat, this has been linked to a higher risk of colon and stomach cancers. The American Institute for Cancer Research recommends no more than 18 ounces of these a week, or a little over a pound.

Harmful rays from the sun can give you more than a sunburn. Ultraviolet radiation can cause skin cancer, the most common kind of cancer in the U.S. And people who spend a lot of time in the sun have a higher risk. Most cases are curable if they're found and treated early, but they can be life-threatening if they spread to other parts of your body. Sunscreen with a sun protection factor (SPF) of 30 or higher can help protect you.

Vegetables and fruits can help stave off a range of cancers in your mouth, throat, windpipe, and esophagus. These foods have things that help your cells prevent damage that may lead to cancer later. You should get at least 2 1/2 cups of fruits and vegetables a day.

A diet rich in vegetables, fruits, and whole grains is a better bet than nutritional supplements to lower your risk of cancer. Supplements don't give you the same benefits as whole foods, and they can throw off the balance of other nutrients in your body. Supplements may help with certain conditions, but don’t bet on them to prevent cancer.

Foods or drinks with a lot of sugar tend to have more calories per ounce. If you have them often, you're more likely to take in more calories than you burn in a day. That can make you gain weight -- and possibly increase your risk of cancer. You don't have to skip the sugar entirely, but keep an eye out for things with added sweeteners.

Human papilloma virus (HPV) is often passed from person to person through sex. It can live in your body for years and you might not even notice. It's the cause of nearly all cervical cancers in women and also can cause cancer of the vagina, penis, anus, mouth, and throat. Girls can get the vaccine between the ages of 9 and 26, and boys from 9 to 21. Using condoms can also lower your chances of getting HPV.

People who exercise are less likely to get cancer of the colon, breast, or uterus. When you're up and moving around, your body uses more energy, digests food faster, and prevents a buildup of some hormones that are linked to cancer. Being active also can help head off other health problems like heart disease or diabetes.

Do you smoke? It causes various kinds of cancer, as well as heart and lung disease. Though the share of Americans who light up regularly has dropped from more than 40% in the 1960s to about 15%, tobacco is still the No. 1 cause of preventable death in the U.S.

You know which one we mean. Drinking too much alcohol can raise your risk of cancers of the digestive system -- your stomach, liver, and colon, among others -- as well as breast and throat cancer. It can hurt tissues in your body, damage your liver, and mix with other chemicals to harm your cells. Men shouldn't have more than two drinks a day, and women should limit it to one.

People who have the hepatitis B virus are 100 times more likely to get liver cancer, one of the fastest-growing kinds. And those who have chronic liver problems, several sex partners, or share needles to use drugs have a high risk of getting hepatitis B, along with people who work with human blood. But a vaccine can prevent infection. Talk with your doctor about it if you think you’re at risk.

The sooner the warning signs of cancer are spotted, the better your odds of recovery. A variety of tests can check for different types, like breast, colon, prostate, or skin. Ask your doctor which of these screenings you should get, and when.