Are you tempted to buy the latest hair, skin, and nail supplement? Or go gluten-free because your favorite celebrity said it helped her skin? Before you take another step, make sure you know the evidence. Because there are many, many myths and misconceptions out there. And that's a shame, because there's actually strong evidence linking skin and diet. And those evidence-based recommendations HAVE been shown to promote healthy, youthful, glowing skin. Here are just a few of