The 10 Healthiest Foods on the Planet

Walnuts

Why They're Healthy:

-- Contain the most omega-3 fatty acids, which may help reduce cholesterol, of all nuts.

-- Omega-3s have been shown to improve mood and fight cancer; they may protect against sun damage, too (but don't skip the SPF!).

Quick Tip:

Eat a few for dessert: The antioxidant melatonin, found in walnuts, helps to regulate sleep.

Get 31 days of meals using these 10 superfoods!