Bulky waist 'causes bowel cancer' Although those other lifestyle choices play a role, this study unequivocally demonstrates that visceral adiposity is causally linked to intestinal cancer. He and his colleagues reached their conclusions after a series of experiments in mice that they knew were prone to developing intestinal tumours. The study is published in the journal Cancer Prevention Research. They split the mice into three groups to test the relative roles of obesity in general, abdominal fat in particular, and diet and exercise. Those in the first group underwent "sham" surgery and were then allowed to eat whatever they liked from a mouse "buffet." Those in the second had their deep abdominal fat removed, before likewise being put on an unrestricted diet. Those in the third underwent sham surgery, but were restricted to 60 per cent of the calorie intake of the others, so their deep fat was limited. Dr Huffman said the mice which were allowed to eat at will and did not have their "visceral fat" removed "developed the greatest number of intestinal tumors, and had the worst overall survival." He continued: "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. They also noted interesting differences between female and male mice. In females, taking out the fat led to a significant drop in tumours, but calories reduction did not, while in males the converse was true. Dr Andrew Renehan from Manchester University, who advises the charity Beating Bowel Cancer, said research was needed in humans to establish if deep fat caused bowel cancer in people too. He said: "This type of fat is a strong predictor for diabetes, but we still don't know its connection with cancer. This research provides evidence to support the hypothesis that there is a link, but there is no definitive research to show this in humans. More research is needed to determine the impact of this fat on bowel cancer. Mark Flannagan, the charity's chief executive, said: "We know that being overweight increases the risk of cancer, and after not smoking, maintaining a healthy weight is the most important thing you can do to help prevent cancer."