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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Cellulose: neither digestible by humans nor our bacteria
Lactose: not digestible by lactose intolerant humans, but CAN be digested by bacteria.
And when bacteria eat lactose, they make a lot of gas which can be uncomfortable. Cellulose just draws in water to the intestines and makes the stool nice and soft while also providing bulk and lubrication.
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