Worrying excessively about our well-being can do us more harm than good. Here’s how to keep your health concerns in perspective. Most nights of the week, my family and I sit down to colorful, plant-powered dinners. But every so often, I tuck into a grilled bratwurst and a tall beer instead. And I savor them. Ironically, it was my breast-cancer diagnosis five years ago that inspired me to relish such occasional indulgences rather than wondering whether they would kill me.