Flatulance is often associated with eating starchy foods. Many fat people tend to overeat and eat a lot of starchy foods which would cause them to produce more gas, resulting in more flatulance. Skinny, medium or obese, people can have flatulance and it can be caused by some foods (such as baked beans, Chili, spicy foods, eggs, beer, etc.) and WE ALL have flatulance to some degree. However, the above poster is correct in saying that obese people can have more flatulance than others because the tend not to exercise as much because of packing the extra weight.