I am the opposite. I eat a low carb paleo diet (lots of meat and veggies and fruit; no grains, dairy, legumes, potaoes, or sugar), and I've never felt better. I know people who are vegan who feel great too. I think it's important to listen to your body and pay close attention to how you feel. Not everyone tolerates food the same way, but I think everyone agrees that processed stuff is bad no matter what. If it comes out of a box, bag, or can and has stuff I can't pronounce, I don't eat it.