Many many food items have been tested in ruminants, as the are the proverbial "cash cow".

Im still looking for such indepth look at digestibility in humans. Hogs are the closest.

However, much has been done to damage the GI, from microbes to tight junction malfunction......which leads to reactions to the biochemicals that cross when they shouldn't.

Farmers make money when their farm animals are healthy. Our medical system makes money when we are ill.

Dave Mac interviews people about their diet and how their health improved. Like 400 people interviewed. Stunning to hear from the people who eliminated or reduced vegetables and relied on meat to fix their health issues. Dr Atkins called this the ultimate elimination diet.

Allowing the gut to heal. And allow body to eliminate the allergens that entered the body,as much as possible.

[The GI tract is a barrier. It's actually the same embryonic tissue as skin.]