"People shy away from nuts because of their fat," Crocker says, but if you pre-pack proper servings in containers, you won't over-snack. About 10 walnut halves or 10 to 15 almonds will help keep you satisfied.

They're also full of omega-3 fats, protein and vitamin E, which helps keep your immune system functioning well. Munch on a small handful of nuts every day to help reduce your risk for heart disease.