I've got a food combination chart that I've followed for 11 years now, since I was 12. Among other things, it advised never to consume fruit of any kind with pretty much any other kind of food. Due to how quickly it digests, fruit will quickly begin to ferment in the stomach if its passage into the large intestine is blocked by the presence of more slowly digesting foods in the stomach. The fermentation will quickly begin expanding your stomach. It's often NOT the foods themselves which cause the expansion, but the combinations we choose that do it. Milk and cereal is another one. Milk will begin to curdle in the stomach when we eat it with grains, but lowfat A&B milk (digestive enzymes) consumed on an empty stomach wont cause that problem.