We are learning more every year about increased incidence, and increased lethality of many types of cancer with rising BMI, especially from younger ages.
link to article
There's a lot to be studied before making conclusions about what might be the cause, much less what might be an effective intervention. These articles always end with "keep good blood sugar control", but who knows if that will change anything. I certainly wouldn't endorse Bariatric Surgery in a particular disease finding, but we DO know that overall survival increases after surgical intervention from the Swedish Obese Subjects (SOS) trial, and from large studies by Dr Christou in Quebec and Dr Buchwald in Minnesota, among many others..