I think a lot of people don't realize that obesity is actually a risk factor for cancer. Being obese puts you at a higher risk of developing certain cancers like breast cancer, ovarian cancer, prostate, colon and even pancreatic cancer to name a few. The higher your BMI actually, the more likely you are to develop cancer. Not only that, the higher your BMI, the more likely you actually are to die from that particular cancer. So if you are obese, meaning that your BMI is 30 or greater and you have a family history of cancer or you feel that you may be at an increased risk for cancer, talk to your doctors.
Even if you don't have a history though, it's important to make sure you get all the necessary screening tests, and this is important for people of healthy weight as well. But make sure you get your colonoscopies, your mammograms, and get your PSA checked if you're a man, to make sure that you don't have prostate cancer. While this is very scary the good news though, is that if you are able to lose the weight, your risk of developing or potentially dying from cancer, does decrease as you lose weight and as your BMI decreases.