Vegetarian, vegan, gluten free and such dieters can be tweeked by simply telling them a bit of history. Among the dinosaurs, the herbivores were the big, slow, fat, dumb ones; while the carnivores were the fast, lean, smart ones.
Despite what the reactionaries assert, the world is not flat nor is it hierarchical. The world is relational. Similarly, how many tweets for that bag of carrots?