In the Wikipedia article Meredith Root says: she acknowledges "that everyone would benefit from including a larger variety of vegetables and fruits in their diets". More accurately, everyone would benefit from moving away from the standard American diet. Whether eating more vegetables and fruits would benefit them more than say meat and healthy fat is questionable at best. Studies that purport to show this are based on observational epidemiology rather than interventional studies. Plants survive because they produce poisons to ward off things that want to eat them.