Irritable Bowel Syndrome Message Boards | Re: What is wrong with this meal?

No veggie or fruit is all soluble fiber. Every fruit and veggie contains both soluble and insoluble fiber. The insoluble fiber give the cells in fruit and veggies their structural integrity. The only time you find pure soluble fiber is in soluble fiber supplement when the soluble fiber has been separated from the insoluble fiber. However, some foods contain more or equal amounts of soluble fiber compared to insoluble fiber.

A peeled sweet potatoes has about 2.5 grams insoluble fiber, 0.5 grams soluble fiber and 1.3 grams resistant starch per 100 grams. Since resistant starch acts like soluble fiber generally speaking and depending on the variety sweet potatoes have nearly equal amounts of insoluble and soluble fiber. This reference has good table giving the amount of soluble & insoluble fiber in a variety of foods but it does not give the amount of functional fiber (eg. resistant starch).

I find I have to be very careful with sweet potatoes. I find I have remove a considerable amount of the flesh below the skin to make sure all of the insoluble fiber from the skin is removed. They have to been cooked very well - until really soft. Even then I can only eat small portions at a time.

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STABLE: ♂, IBS-D 50+ years - Science of IBS

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