I don’t know. Something about eating a lot of fiber. I cant do it for example. I eat some veggies, but probably not “enough” fiber compared to modern recommendations and i cant process it. I am doing OK without it from subjective perspective. Also i am interested how much nonsoluble fiber did regular people eat before modern vegetable and fruits. Potatoes and cabbage, wheat and some roots and max some berries max.

Like where would the need for the fiber come from evolutionary.

Maybe instead of processing food to add more protein into it — even Starbucks sells "protein drinks" now — they should process food to have more fiber instead.

I usually stay out of health convos because it's just not my wheelhouse, but I think most people would benefit from extra fiber. It has an obvious direct benefit to your life the very next time you use the bathroom. I don't know if it is the answer to the rise of colon cancer; this is well studied and seems really easy to work with? We would surely know already. But I do know it's worth doing irrespective of that.

This is my personal bet. It's just low fiber diets.