Actually, in this extensive study published in the Journal of The American Medical Association, higher fat consumption was associated with decreased risk of breast cancer, with those consuming higher carbs having a 15% increased breast cancer risk. Similar, but less profound results, were found with reference to colon cancer, showing a slightly decreased risk in those consuming the higher levels of fat. With respect to prostate cancer, being fat is clearly a risk (generally caused by a high carb diet) but no association is found with fat consumption – again as recently described in JAMA.