I'm going to use "CPT" for the Cancer Prevention Tips series, just so you know.
And the first tip is one of the ones I'm finding hardest to implement - drop your body fat index to under 25%. Why? Because it seems that obesity increases the risk of cancers of the breast (postmenopausal), endometrium (the lining of the uterus), colon, kidney, and esophagus.
I'm starting with this tip because this one takes the most time to reach, unlike a 'don't do this/do that' quickie.
That said, I'm NOT willing to say that it's the obesity itself that directly ups the risk, although that could be it in some cases. For esophageal cancer, for example, the largest risk factor is gastric reflux. But being obese increases the rate of reflux, just because of the weight/pressure on the stomach pushing the contents up to the esophagus. And, as we'll get into later, many of the activities involved in losing weight are also associated with lowering cancer risks.
So, to repeat - Cancer Prevention Tip #1 - start work towards dropping your weight.