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"Fiber is technically a kind of carbohydrate in the biological sense. But because of the way the human digestive system works, you can’t break down fiber to get energy from it. Fiber passes through your stomach undigested until it hits your large intestine.
Most keto-friendly vegetables are high in fiber.
When fiber gets to the large intestine, things get a bit interesting. You can’t digest that fiber, but your gut bacteria can, at least for certain types of fiber. So fiber is essentially food for your gut bacteria, not for you.
Sometimes, the gut bacteria break down fiber and produce short-chain fatty acids (SCFA) like butyrate. You can digest some of those SCFAs, but those are fats, not carbs. So to the extent that you get any actual calories or nutrition from fiber, it’s actually fat, not carbs.
That’s why fiber doesn’t count as a type of carbohydrate. Assuming your gut bacteria are healthy, fiber will actually add a little bit of fat to your diet, not carbs."
https://paleoleap.com/net-carbs-carb-counting-everything-need-know-keto/