A man sunbathes in Malmo, Sweden, in July. Humans (and other animals) make vitamin D when exposed to sunlight. Johan Nilsson/AFP via Getty Images hide caption

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Johan Nilsson/AFP via Getty Images

Medical Panel: Don't Go Overboard On Vitamin D

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Cycling has at least tripled over the past two decades in several big cities across the U.S., including Minneapolis, Chicago and San Francisco. Jonathan Steinberg hide caption

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Jonathan Steinberg

Switching Gears: More Commuters Bike To Work

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Eat Up: Eating a large meal at the holidays won't have a big impact on your weight, says one physiologist. That's because your brain keeps a close watch on food intake and can tolerate the occasional big meal. It's slow, steady weight gain that's more problematic. iStockphoto.com hide caption

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iStockphoto.com

Post-Feast Weight Gain Isn't As Bad As You Think

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Food Banks Fill In The Gap On Thanksgiving

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Bow Down To The Medicinal Power Of Cranberries

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Professor's Weight Loss Secret: Junk Food

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San Francisco Orders Up An Angry Meal

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An AquAdvantage genetically engineered salmon behind a non-transgenic Atlantic salmon sibling of the same age. Courtesy of AquaBounty Technologies hide caption

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Courtesy of AquaBounty Technologies

Experts recommend that parents consult with a nutritionist to make sure vegetarian children get what they need. Kim Gunkel/iStockphoto.com hide caption

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Kim Gunkel/iStockphoto.com