Maintain a healthy weight
Overweight adults are at a greater risk for colon, endometrial, breast (post-menopausal), esophageal, pancreatic, and kidney cancer. As one's body mass index increases, one's risk for other major health problems, such heart disease, stroke, diabetes, gallbladder disease, sleep apnea, and osteoarthritis, also increases.
Choosing foods that are low in fat and calories is one key to maintaining a healthy weight. Keeping an eye on portion size also is key. Nowadays, many restaurants serve large portions, so share with a friend or save half of the meal for lunch the next day. And when making food choices, bear in mind that low-fat or fat-free doesn't always mean low in calories!
How to know if you're overweight? Consult a Body Mass Index tool.