The latest research on this front really doesn't do much "blaming the victim", which seems to be the default mindset when someone avoids a food or food ingredie

The latest research on this front really doesn't do much "blaming the victim", which seems to be the default mindset when someone avoids a food or food ingredient. IMO, it's almost certainly not "something wrong with your gut", but rather your gut is ill due to long-term assault from poor external inputs. Eventually nearly everyone gets unlucky. The lucky ones just mistake a "disease of civilization" for a "geriatric condition". Gluten, gliadins, and lectins, present in wheat and other grains, basically amount to plant defensive chemicals. For many people, consumption of these plays a strong role eventually has various deleterious effects which. The impacts are complex, to say the least, and a matter of ongoing research. However, the basis of treatment is straightforward: eliminate everything with grain. Gluten isn't enough, especially if you have severe GI damage. You may find it helpful to check out resources and books on the "paleo diet" as regards restructuring your eating this way.