Late into this one
but...
Almost everything is bad for people in large quantities, fruit, water, salt etc.
On the other hand, we need a bit of all of these to work. People are biological and relatively inefficient with the benefit of adaptability. People are not machines to be dosed with precise quantities of chemicals for "perfect" operation.
Cutting food groups out of your diet eventually will result in nothing being left at all.
Managing a good variety of gut bacteria can make as much difference to your health as any other intervention, and they need a variety of foods to operate too. There is not enough research to "recommend" a selection of fauna, and I don't expect a stampede of people to rush for fecal transplants to correct them either.
The old rule of "everything in moderation" remains fairly sensible, and does not end up with a lot of conflicting rules.
Biting the hand that feeds IT
