That's mainly because any dramatic change feels like a change and they haven't seen the downsides yet. Some downsides take decades to develop with some diets.

That's mainly because any dramatic change feels like a change and they haven't seen the downsides yet. Some downsides take decades to develop with some diets. And the argument of "now I feel so much better" I have heard it with absolutely every kind of diets. Vegetarians now eating meat. Meat eaters now vegetarians. Paleo. Gluten-free. Crude/Raw...