Photo: Getty Images

4 of 5
Walnuts: Memory Booster
Make room, almonds. A new study in the Journal of Nutrition, Health & Aging found that subjects ages 20 to 59 who ate an average of five walnut halves daily performed significantly better on cognitive tests (memorizing a series of symbols and numbers) than those who didn't eat them. The brain-boosting effects may come from the nut's high levels of antioxidants and omega-3s.