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Acidic foods (citrus fruits and cooked tomatoes) should be treated with extra care as well, as their acidity can cause both upper and lower GI distress. Once again, follow the rules for insoluble fiber and eat these foods in smaller quantities incorporated with soluble fiber – but please do eat them.

Fructose, a fruit sugar, can cause gas, bloating, and diarrhea (this is typically not true for sucrose, or plain table sugar). Fruit juices, particularly apple and grape juice, are often sky high in fructose and even more problematic than whole fresh fruit. It's simply much easier and faster to drink a large glass of juice (and ingest a great deal of fructose) than to eat an equivalent amount of whole fruit. So treat juices as you would insoluble fiber and drink them carefully, with soluble fiber foods.

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