Less sugars, carbs, and highly glycemic foods such as wheat, rice, and corn will probably make the most difference. Basically avoid the sorts of things in a Little Debbie snack. It'll improve your skin a lot too!

Man, I love the Little Debbies snack cakes.

What other said plus L-Glutamine seems to be part of protecting the intestens.

https://en.wikipedia.org/wiki/Glutamine

> On the level of tissue, glutamine plays a role in maintaining the normal integrity of the intestinal mucosa.,[12] but randomised trials provide no evidence of any benefit of nutritional supplementation.[12]

It's cheap to buy and try if it changes anything for you.

Antiinflammatory foods are well established online, certain fruits and things (cinnamon, figs, etc).

But the ones people miss a lot: yogurt (to empower good bacteria cultures), and cannabis (yes, marijuana).

Smoked cannabis or eaten cannabis?

Vaporized, or eaten, for healthiest results.