Ummmm yep, for the past 3 years since I got terribly sick (colitis resulting from a gut parasitic/yeast infection) after a 3 year stint with traditional foods. I heard so many great things about paleo or low carb/high fat/protein helping gut health, but it did nothing for me and made me very weak and depressed. I tried TF, paleo, SCD, GAPS, Healing Naturally by Bee, etc. Instead ended up feeling better and better the more plant based I went, especially shocked that whole grains made me feel so good. Ultimately I required medication to get rid of my infection, but my health has continued to improve going more plant based.
But I don't notice any difference being strict vegan as I've been for a few months, vs flexitarian as I had done for several months.
For me personally, I have to face that my health pursuits can end up a form of orthorexia. Happy people are healthy and are good at letting go of stress, so I just need to not stress out about what I eat. I also realized I feel the need to be different (in almost every area of my life), so I go for diet extremes. paleo to McDougall, hello.
I'm back to thinking I'll just chill out with what modern science supports, the way the rest of the world has truly always eaten despite different fad diet's claims: whole foods flexitarian. DH is vegetarian for lent so I am supporting him by not cooking meat in the house at the moment, then we'll probably go back to having meat/poultry/fish a couple times per week.