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The Things Julia Child's Told Us Not to Crowd

We're talking about: Mushrooms
Why you should eat more of them: We tend to run particularly low on vitamin D (aka the sunshine vitamin) in the winter, leaving us at higher risk of brain fog, depression and fatigue. Mushrooms are one of the few foods that are naturally rich in vitamin D, says Laura Jeffers, MEd, RD, LD, a dietitian with the Cleveland Clinic. Just like us, they create their own when they soak up UV rays—check the label to see if they've been processed in UV light or ask the vendor at your local farmers' market.
Keep this in mind too: The fungi may also help keep your immune system strong, suggests a small study in the Journal of the American College of Nutrition.