Thank you, I think this is the case for me. For many years I had very debilitating IBS which after i went low carb for diabetes, disappeared. It feels like there is a food type that spikes me, seemingly grain. I interested when you said your endo as I really feel I could do with discussing my results with someone to help me understand. How did you find your endo?
I don't see him for diabetes, although he has always had a peek at my bloods when I see him. I see him for an errant thyroid. I'll spare you a long preamble, but I learned he is the guy who sees the cases others are lobbing in the "too difficult" bucket, so requested a named referral to him. (We are allowed named referrals under the NHS.)
When I initially saw him he ordered a mahoosive list of bloods for automimmune conditions, due to my family history. That list included a Coeliac panel. I "passed" all the tests, although my coeliac and another were marked as "inconclusive".
For a true coeliac panel result you have to eat plenty gluten for a couple of weeks prior to the test, but with the Endo's agreement I didn't do that, as it would not be reflecting my day-to-day life.
His recommendation was based on his statement that "..... people with autoimmune conditions do very well gluten-free...." He felt that whilst nothing conclusive had come up on my extensive panel, I'd likely have "something" lurking.
I hadn't thought I had any real issues with gluten, but after several weeks without it at all (think Worcestershire sauce, soy sauce, many spice blends, cola and so on) I actually felt more "well".
Going GF isn't easy, and to have a true picture you have to go totally GF. Cutting down doesn't work with gluten if you have an issue.
If you feel your issue is grains, just cut them out for a couple of months and see how you go.
I eat very few grains, and can't say I miss them.
When you discover feeling really well, it's easy simply not to bother with whatever stuff it is that's not helping you.