The explosion of every modern ailment you can think of has been caused by the replacement of traditional foods with plant foods in the last 100 years. Heart disease, cancer, mental illnesses, autism, digestive issues, skin issues, poor eyesight, tooth decay, really all of it is caused by malnutrition and toxicity from plant based diets (almost everyone eats a plant based diet in the west). It blows peoples minds that hunter-gatherers would commonly live into their 70s (if they survived childhood) without sanitation, clean water, dentists or any medicine whatsoever. All while having larger brains, being stronger, larger, more fertile and having perfect teeth.