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If you like spinach, try curly kale.

Why it's so good for you
Kale bests spinach when it comes to vitamin K, which plays a key role in blood clotting and bone health. It also contains detoxifying compounds that may protect against certain cancers, says Babb.

How to enjoy
This tough, slightly bitter leaf can make for quite a mouthful when eaten raw, especially if you skip a crucial prep step: Before using in salads or sides, massage kale with olive oil and sprinkle with salt. This tenderizes and flavors the leaves—and helps them crisp up when you're baking chips.