I've read a couple of times that vegetables actually increase intestinal permeability because they're insoluble or something. Here's a passage I recently found on this website:
"Not to mention everytime you eat a plant food, either the fiber or the polysaccharides or the various other toxins will increase intestinal permeability, and your body needs things like zinc and cholesterol - also used to control blood sugar - and other nutrients to repair it after every single meal."
Now I'm not really sure what to make of this because I feel incredible when I eat raw greens. I've also read countless testimonies of people who have fixed their gut/digestion issues by eating plenty of raw veggies. So why do some people say stuff like this?
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No paleo fiber actually has ever been found to be bad as far as I can tell. Insoluble fiber being abrasive etc is a myth.
If you have an imbalanced microbiota that favors species such as Klebsiella that contributes to leaky gut, or a yeast overgrowth, or another overgrowth, decreasing vegetables and fiber and carbs may be meaningful. But I don't think that is the case generally.
Veggies are not necessarily bad. Grains are bad for your gut due to gluten and lectins. GMO corn or soy are bad for your gut because GMO causes leaky gut. If you have existing gut issues, beans are hard on you. Try soaking them and rinse several times before cooking them. The person who you quoted was probably talking about the FODMAP diet which is designed to help people with irritable bowel syndrome. If you want to learn more, search for Dr. Siebecker or read SCLifestyle.com or IBSFree.com.