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People who eat foods containing omega-3 fatty acids like salmon and tuna, have a better handle on their emotions and are more likely to be upbeat and agreeable, says Sarah Conklin, Ph.D., a professor of psychology and neuroscience at Allegheny College in Pennsylvania. The American Heart Association recommends eating two four-ounce portions of fish twice a week. But don't overdo it: Stick to one can of albacore a week to avoid mercury poisoning. Walnuts and flaxseed are also packed with the get-happy proteins, which have been proven to prevent heart disease.