We can all be vain at times. But sometimes our vanities get in the way of common sense, good health practices. For me, the big health-hindering vanity is shoes—the more impractical the better. Since it's almost summertime, I've stocked up on foot constricting—yet terribly stylish—sandals. Would my podiatrist approve? No. Do I know he wouldn't approve? Yes. Is this stopping me from buying the shoes I love? Well, not really. Which means my feet end up having white dry spots and pink blisters all over them. But I'm not alone. Some people hate the way they look in glasses so much…