The grains and legumes are hard on the gut.
And they actually tend to strip nutrients from your body —almost worse than empty calories
Whole grains arent bad. Its the processed only part grain concoctions that mess up the gut, spike insulin more so, etc.
Long fermented breads and similarly treated beans & grains fed people for thousands of years without so many people having gut issues or they wouldnt have continued to eat them for all those years.
Its the modified seeds, mass farming, over processed, convenience packaged foods of today our bodies struggle with.