I totally hear you about being bombard with information!!!
Ill tell you why I support the FODMAPS as a trial...it is recommended as a first line therapy for IBS because of the data that backs its use. eg relief on symptoms in IBS patients eg....
With gut health it actually turns out that while we can use these diets as a guide, we often have our own unique profile of tolerable foods.
Unless you have something like I do, SIBO, then a probiotic can help (especially if you have been in antibiotics at some point in your life).
If it is IBS then FODMAPs guidance + probiotics should help you.
I ALWAYS ask for evidence. Both from science studies AND experiences. We are very complex creatures arent we?!!!
If there in an automiinune component to your hyperthyroid (antibody tests?) then you may have food intolerance beyond fodmaps! Welcome to the world of gut health
Just as a side, you mention running? Do you know the work of prof Tim Noakes? A long time runner. There are some good interviews out there with him on the internet. Just mentioning in case he resonates with you. He is a leader of the highfat-lowcarb movement. It works for many but not for all, and once again we have to find our own middle ground with it. For me, I am better avoiding most grains and so his work is interesting to me. One of the objections to his style of eating is that it lowers thyroid hormones!! Im not sure if this is true (i havent studied it).
Anyway, just MORE info for you!!!
basically what I wanted to say is FODMAPs is evidence based. And that you could ask your doctor for a gluten test BEFORE you stop eating it (as once it is out of your system the test wont show any reaction).
Take care! Sorry for the extra bombardment!!
If you ever want to know more about the gut health side of things, I can give you more info. But not now