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Omega-3 fatty acids

Why you need it: Fats get a bad rap, but certain types of fats—including omega-3 fatty acids, a type of polyunsaturated fat—are actually very healthy in moderation. Omega-3s contribute to brain health and may help reduce inflammation.

Where to get it: There are two categories of omega-3 fatty acids: Alpha-linolenic acid (ALA) is found in plant sources such as vegetable oil, green vegetables, nuts, and seeds, while eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)—the second category—are found in fatty fish. One cup of tuna salad contains about 8.5 grams of polyunsaturated fatty acids.

Try this recipe: Apple and Cheddar Tuna Pitas (with walnuts!)

Next: Potassium