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Few foods are better for your brain than walnuts. They're a great source of serotonin, a neurotransmitter that curbs your appetite, as well as vitamin E, magnesium, folate, protein, and fiber. Walnuts boast more heart-healthy omega-3 fats than salmon, making them a good antidote to seasonal depression.
This wonder nut is also packed with anti-inflammatory polyphenols. Many of the compounds in walnuts, such as vitamin B5 and folic acid, can be destroyed by heat, so it's best to eat them raw. If you find them too bitter to eat whole, use them in place of pine nuts in your pesto or grind them up and sprinkle them over cooked vegetables.