Olive oil
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Olive oil is the best-known healthy oil, and with good reason – it's low in saturated fat, high in monounsaturated fat, and full of anti-inflammatory nutrients. It also has a special advantage over most other foods: "From a health standpoint, olive oil has got the test of time," says Dr. Don Hensrud, a nutrition specialist with the Mayo Clinic.

Try it: Olive oil has a smoke point similar to that of vegetable shortening, but extra-virgin versions may have olive particles in them that can burn. Hensrud suggests using olive oil in marinades and sautés, and raw in salads for added flavor.