Bonefish Grill's fresh fish expert grills up the new Ocean Mixed Grill for Two. Two types of omega-3 fatty acids are abundant in seafoodeicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). In humans, high DHA levels are linked to raised levels of dopamine and serotonin, the same brain chemicals that antidepressants boost. What's more, a shortfall of DHA in animals has been linked to symptoms and markers that mimic depression. "You're at greater risk of being depressed, anxious, and irritable by avoiding fish," says Joseph R. Hibbeln, M.D., acting chief of nutritional neurochemistry at the NIH's National Institute of Alcohol Abuse and Alcoholism.