The afternoon slump is a real-life problem we all face — lunch feels like forever ago, your stomach is begging for something, and dinner is hours away. Once you’ve had a quick snack, all that fatigue fades away. Make that a snack rich in protein and you’re in even better shape. Eating protein not only gives you a boost of energy, but it also takes a good amount of time to digest, which means you won’t feel peckish again in an hour. Here are 20 great picks.