FOS is fructooligosaccharides a rapidly fermentable soluble fiber which can cause gas, bloating, and subsequent abdominal pain even in normal individuals as discussed by Heather here. Inulin is a FOS. Many fruits and vegetables contain FOS such as onion, garlic, asparagus, leek, and Jerusalem artichoke.
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Re: Restarting Benefiber+Acidiphillus Questions/Concerns
