For leaky gut, my last suggestion may be the most important. That is, you want a much thicker mucin layer in your intestines, against leaky gut. Oligosaccharide-enhanced Inulin (at GNC called “Prebiotin”), should be consumed liberally. It dissolves in water and has just a slightly sweet taste.
Likewise, there is a root vegetable called Jicama, that is slightly sweet tasting, crunchy, and has a lot of “Oligofructose Inulin” (same stuff) in it, though it is very low calorie. It makes a fine snack, which encourages thickening of the mucin layer.
Other sources are less available or tasty, like chicory and Jerusalem artichoke.
Thank you.