Just an ounce of walnuts, or 15 to 20 halves, is loaded with antioxidants. They're also cholesterol-free and low in sodium and sugar. Nuts are laden with calories, though, so be mindful of your intake.

Nutrition facts (1 ounce): 185 calories, 18.5g fat (1.7g saturated fat), 4g carbohydrates, 8g fiber, 4g protein