Overly restrictive diets, to me, seem suspect because they can become the catalyst to sell books, products, or put more $$$ into the coffers of certain industries like the cattle/dairy industry.

100%! I began seeing this as well. I remember listening to a podcast with some big Joe whatever promoting this kind of diet and he started lambasting avocados as a scheme to control and manipulate us...I was like, dude. Come on. :))

I'm hoping your time at the Mayo Clinic brings answers (and healing) <3