I'm not sure we can say we all "do just fine" on a low fiber diet. The current #1 killer in most Western countries is heart disease and we know high fiber diet

I'm not sure we can say we all "do just fine" on a low fiber diet. The current #1 killer in most Western countries is heart disease and we know high fiber diet decreases the risk of developing heart disease. High fiber diets also decreases the risk of other very, very common aliments like stroke, obesity, and type 2 diabetes. I badly crave donuts, especially on weekends; I can't come to the conclusion my body requires more donuts.