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The Feel-Good Fish
When Lori Zanini, a nutritionist in Manhattan Beach, Calif., is glum, she tries to eat cold-water fatty fish, such as salmon, sardines, mackerel, herring and albacore tuna. The fish's omega-3 fats aren't just great for your cardiovascular health; they're also linked to enhanced mood and brain function. Some studies have even found that mild-to-moderate depression may be relieved with fish-oil supplements, which are high in omega-3s.

How she eats it: There are tons of ways to prepare fish, but Zanini keeps it simple, usually just baking it, or marinating and grilling it. We love this easy roasted salmon with honey-dijon glaze. Or, try these salmon burgers, which are tucked into pita pockets.