I think that it depends both on genetics and on what one eats/drinks. I am pretty flat there but I tend to have colon problems. I had colitis in the past and all the protein shakes I drink certainly don't help the problem. Very often, especially at night I felt bloated and my stomach kind swells up, but then the next morning is flat again. My doctor is against colonics, he says they don't help and on the contrary they can aggravate the problem because they deprive one of the intestinal bacteria etc etc, so he says. I wish I could reduce the number of protein shakes I have every day, but since I am a vegetarian they are the main source of protein for me (together with egg whites).