Energizing eats: Nix your fruit juice for whole fruit instead.

Fruit juice—even 100 percent fruit juice—is concentrated in sugar. Slurp down a glass, and you’ll suffer an energy crash shortly after. A piece of whole fruit, on the other hand, provides filling fiber and energy-sustaining power along with that shot of sweetness. Bonus: A cup of orange juice is 110 calories and an orange only 60.