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Consume Calcium—With a Side of Vitamin D

You already know that calcium is the poster child for building strong bones, but studies have shown that the nutrient doesn't do the body much good without its sidekick, vitamin D; calcium needs D in order to be sufficiently absorbed from the digestive tract. While some doctors recommend calcium supplements for bone health, the jury's still out on whether they're a healthy alternative (some studies have suggested they can harm the heart). I recommend consuming 1,000 milligrams per day through food. If you're not a dairy lover, don't worry: Kale, tahini and almonds are all surprisingly potent sources of the nutrient.