Walnuts are a top nibble in that they fight free radicals that can damage our body's cells and cause disease better than just about any other popular nut.

Walnuts are loaded with antioxidant polyphenols, compounds that interact with free radicals to stabilize them and prevent them from wrecking havoc on our cells. Walnuts have almost twice as many antioxidant polyphenols as almonds, peanuts, pistachios, hazelnuts, cashews, macadamias, Brazil nuts, and pecans, researchers said.