Its natural to stop making lactase, the enzyme that degrades lactose, and there are no enzymes in humans that can degrade cellulose. Cellulose is actually good for you and beneficial for your GI but milk is not.
I dont understand why cellulose is good for the GI despite humans not making the enzymes, and milk/dairy products upsets the GI despite being the same case.
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If you have enough lactase, you break down the lactate in the small intestines and absorb the individual pieces. If you don’t have enough lactase, the lactose proceeds to your large intestines. The bacteria here go wild eating the lactose and creating waste products (mainly carbon dioxide and methane), which causes the bloating and discomfort associated with lactose intolerance.
Cellulose is mainly unaffected by any of the bacteria or enzymes in your gut, so it passes through, chewed and acid-bleached but otherwise intact.
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