What is your diet like. I kept mine very bland for years just because of fear of causing problems. I eat more of a normal diet now but still don’t eat fruit, only well cooked vegetables, no soda, no alcohol, no chocolate, nothing spicey. Sounds terrible, but there’s plenty of other things or I just eat a very small portion of things that are no no’s. This may not be a problem for you at all. Just a thought.
I eat everything now except chocolates , they still somehow manage to give me instant diaroehha . Also since I workout after office so my sugar intake is also very low. I practise 16/8 intermittent fasting now , wherein my first actual meal is at 2 pm lunch time. Big box of rice and eggs or chicken. Next meal at 5 and then some preworkout snack at 7 and post workout one protein shake and dinner at 9:30 ish.
I mostly eat chicken , hard boiled eggs, rice , brown bread, peanut butter , some fully cooked vegetables. Outside I'll eat pasta, beer/whiskey sometimes.
I think limiting sugar is the best way to a healthy gut for me.