Too much insoluble fiber (like what's found in berries) can irritate the GI tract and it's these spasms in the colon can cause D or C. If you eat these foods with a good soluble fiber base (usually bland foods, like rice, potatoes, or white bread) this can provide a "cushion" for your digestive tract. Oatmeal contains both SF and IF, so it's safe for most people - especially if it's well-cooked and eaten with more SF (like toast). Bananas are also a good source of soluble fiber. Berries are higher in IF, but most people seem to tolerate them fine when they're pureed and mixed with a SF fruit like bananas. I think it's important to find a good mix of SF and IF in order to prevent IBS episodes.
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Re: Jenny833
Also, did you see Heather's response to another post of yours? It's here: 
