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Can you ingest bacteria to offset the harm caused by antibiotics, or to prevent infection and diarrhea? That’s the promise—and puzzle—of probiotics, the supplements and foods that contain “beneficial” bacteria, including yogurt, buttermilk, kimchi, and miso. Proponents of the popular health trend—including companies that sell probiotics in food and dietary...

Your body can benefit from the sun in multiple ways. But too much sunbathing can damage your skin and eyes and increase your risks from cancer. So, as summer draws to a close, how much sun should you get to stay healthy, without exposing yourself to risks? Because sunlight can...