I would add to that list (of things that damage the GI tract) drinking alcohol on a regular basis. Alcohol can thin the GI tract out. How much you have to drink I don't know. But, another reason why booze is bad for you.

I developed leaky gut from taking antibiotics. I have read and have used glutamine, an amino acid, to help with this. I think any leaky gut problem should include some glutamine. The powder is the way to go. Glutamine is good to have on hand (in powder form) because it can help soothe your GI tract. You mix the powder in some water - making it into a milky white drink -and you can feel it going down as it soothes the GI tract. (The taste is palatable.) Glutamine is best used on an empty stomach. Glutamine is safe to take. It is the most abundant amino acid in the body, I believe.

http://www.fungusfocus.com/html/l-glutamine.htm

I used the glutamine and some other things like butyric acid. Butyric acid is found in foods like butter.

https://www.dcnutrition.com/products...cordNumber=262