2. Munch on Nuts

For a mood-lifting snack, stash walnuts in your desk drawer. Or sneak salmon into your salad for lunch. They're both packed with omega-3 fats, which may make people less prone to depression—and easier to get along with, say researchers from the US University of Pittsburgh. They measured the blood levels of omega-3 fats (a reliable indicator of consumption) of 106 healthy adults and gave them psychological tests. Those with the highest omega-3 blood levels scored 49 to 58% better on the tests than those with the lowest blood levels.

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