An apple a day may keep the doctor away, but this tart fruit can cause large pockets of gas to form in your digestive tract. Sorbitol is a sugar in fruits such as apples, bananas, pears, peaches, raisins, and prunes. Bacteria ferment this sugar into a foul-smelling gas. Many artificially sweetened foods also have sorbitol, so sugar-free candies and gum can cause the same problems.

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