There might be much more caffeine than you think in those supplements you're taking. There also might be much less. Janine Lamontagne/iStockphoto hide caption

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Federal health officials recommend 1,000 milligrams of calcium per day for people younger than 50, but some are overdoing it. hide caption

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Staying fit and eating well can help cancer survivors, too, a review of the latest evidence shows. Lucy Pemoni/AP hide caption

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