More Visceral Fat Means a Greater Risk of Intestinal Cancer

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We know that removing visceral fat extends life in mice - even a drastic measure such as surgery to remove the fat increases mouse life span. Given that mice are little cancer factories, it shouldn't be surprising to see that at least part of this effect on life expectancy stems from reduced incidence of cancer:

There has been some skepticism as to whether obesity per se is a bona fide cancer risk factor, rather than the habits that fuel it, including a poor diet and a sedentary lifestyle. Although those other lifestyle choices play a role, this study unequivocally demonstrates that visceral adiposity is causally linked to intestinal cancer.
Prior research has shown that obesity markedly increases the likelihood of being diagnosed with and dying from many cancers. [Researchers] sought to determine if removing visceral fat in mice genetically prone to developing colon cancer might prevent or lessen the development of these tumors.

They randomly assigned the mice to one of three groups. Mice in the first group underwent a sham surgery and were allowed to eat an unrestricted "buffet style" diet, for the entirety of the study, which resulted in these mice becoming obese. Those in the second group were also provided an unrestricted diet and became obese, but they had their visceral fat surgically removed at the outset of the study. Mice in the third group also underwent a sham surgery, but were provided only 60 percent of the calories consumed by the other mice in order to reduce their visceral fat by dieting.

"Our sham-operated obese mice had the most visceral fat, developed the greatest number of intestinal tumors, and had the worst overall survival. However, mice that had less visceral fat, either by surgical removal or a calorie-restricted diet, had a reduction in the number of intestinal tumors. This was particularly remarkable in the case of our group where visceral fat was surgically removed, because these mice were still obese, they just had very little abdominal fat."

Link: http://www.eurekalert.org/pub_releases/2013-03/aafc-vfc022813.php