It's the middle of the afternoon, dinner is hours away, but your stomach is growling. Should you have a snack? Yes, as long as you choose wisely. When done right, snacking can be a key component of a everyone's daily diet, says sports nutritionist Deborah Shulman, Ph.D. "Eating every three or four hours can help control your appetite." It can also provide nutrients you need before and after a workout, says Pamela M. Nisevich Bede, M.S., R.D., a nutrition consultant for Swim, Bike, Run, Eat! But be judicious with your mini-meals. ...