What is actually happening on a bad day Two things, and they are separate. The first is gas, and gas can be a sign of fermentation, which is the thing you wanted. When bacteria ferment certain types of fiber, they produce short-chain fatty acids — the butyrate we talked about in lesson two — and they also produce hydrogen and carbon dioxide as byproducts. In an adapted gut, other organisms consume that hydrogen almost as fast as it is made. In a gut that has been eating 15 grams a day for years, those hydrogen-consuming populations are small, because nothing has been feeding them. So the gas accumulates. Give it a few weeks of consistent intake and your gut microbiome begins to adapt. The second is water. Certain fibers help hold water in the bowel, which can help soften stool. If you add a lot of fiber and do not add fluid, you get the opposite of what you were going for — and this is by far the most common reason someone tells me a fiber supplement made things worse.
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