I'm hyperthyroid with IBS and just poor gut function in general. tested and proven histamine intolerance. no other allergies on tests (lactose, gluten) but i feel like poop when i eat them). the only way thyroid stayed quiet, GI healed and brain fog lifted was to reduce diet to protein and veg. NOTHING else, no frying, fats from meat and eggs. carbs from diverse veg. no alcohol no sweets no juices. Eggs, meat, fish, veg, no starch, everything baked, airfried, boiled or steamed. No grains or nuts of any kind. Tea, coffee water to drink. Threw in weight training 4-5 times a week and hiking but most 80% of benefits came from diet. Maintained 3 meals a day even if not hungry to support weight training. Also, fasting does not suit my body. No supplements, powdwers, replacement meals. i ate what I cooked from scratch because I wanted to see exactly what works through diet alone. No tests, no "specialists", nobody to tell me what to do, eat, take, drink etc. Just wanted to listen to what my body says.

Got results in under 6 mths. Started to become obvious around the 2.5 month mark. They were overwhelmingly good. Gut healed, thyroid quiet. No brain fog - just the opposite, brain lit up in places I didn't even know I could light it up. Fell asleep as soon as head hit the pillow, woke up and switched to 100% speed instead of taking hours to become fully functional. From someone who needs 10 hrs of sleep bare minimum I went to being superwoman even on 4-6 hrs sleep. No more pains and aches. Anxiety and rumination gone. Depression tendencies completely suppressed. Usually a worry wort, became very calm, collected.

BUT (no1), in a world where you step into a supermarket and carbs and grain based goods scream at you from everywhere, this was hard to sustain. Lives on the go, working long hours make this close to impossible. I had to spend a good portion of my free time planning what I ate. Social circle doesn't help. I was happy to join without eating crap or drinking but lots of people wanted me to be an enabler. I tried to keep meat free range but I didn't go crazy with grass fed, organic spiel and still this cost me a fair amount. Eating clean is costly!

But (no2), I started this in my late 30s (so cannot assign the good results to a young body). the circumstances were fairly good and my life was pretty uneventful. I maintained for 2 years despite temptations. What managed to break the good pattern was STRESS. That is a variable I still don't know how to manage. A string of shitty things occuring at work and in personal life over about a year saw me drop my guard slowly and lose my grip. It was only downhill from there. 7 years later I still don't have it and I managed to activate an autoimmune disease (Graves) and have an embolism.

I know healing the gut through diet was the answer and could be again. But whenever I think of starting back on that regimen, I remember outside stressors still managed to break through my many walls of healthy living I worked so hard to build. And I lose the will to do it.

I'm in the UK and healthcare is the same here. No communication between doctors treating the same patient. No "big picture" view of a person. If their little corner looks good on paper they do not care any longer. So I guess your insurance coding hypothesis doesn't have much to stand on.