Ha...diet, yes vast and interesting question! And I haven't found a simple answer yet.
My PhD was on nutrition and neurosciences, and I loved my studies! But let's be honest, it's hard to study that as nutrition is a field in constant evolution and regression. I say regression as things supposed to be bad for you when I was kid (like eggs?!) are now good for you, or the other way around. I find it confusing, and although I am definitively interesting in looking at diet and make some changes to feel better, I don't know what source of information to trust. Talking to people with AxSpa, it seems we all find things that work for us somehow, and that's good.
I did see a dietitian as some point because I had IBS symptoms. I did the FODMAP diet and I felt a lot more energy and better digestion on it. But this diet is too restrictive so you can't keep it up long-term. It was more to identify food that might trigger some symptoms, and the answer is not crystal clear. So I stay in my confusion about what can make a difference. What I do is I cut gluten where I can, because too much is not good for me, not much alcohol, and I don't eat much sweet things in general.
Now I am more intrigued about the studies on microbiome coming up. I am tempted to do a gut health reset diet. Maybe I believe more in that approach, a way to cleanse my guts and see what long-term effect it can have? I haven't' tried yet but I have found people who swear by it!
If anyone has tried one of these gut health diet, let me know! Thanks 😀