This is an interesting study about bread consumption and the microbiome ...

https://apple.news/ALUkSc72pRYWYKeGl83MW5w

I think the big takeaway isn't necessarily that one type of bread is better than another (there are a lot better things to eat than wheat products that are nutritious, have lots of fiber and minerals, etc.) but what's interesting here is how an individual's microbiome really becomes the deciding factor over how nutritious one class of food is over another. This sort of explains how one person can be very passionate about eating one class of food (as they seem to get a lot of benefit from it) whereas another person can have a completely different experience. This is likely one key reason why a particular diet can really benefit some but not be so beneficial to another.

"We need more research and larger studies to validate this approach, but we envision a future where each of us would have their microbiome profiled and then receive personal nutrition advice ..."