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The researchers and others blamed the low levels on a combination of factors, including children spending more time watching television and playing video games instead of going outside, covering up and using sunscreen when they do go outdoors, and drinking more soda and other beverages instead of consuming milk and other foods fortified with Vitamin D

"This appears to be another result of our unhealthy lifestyles, including a sedentary society that doesn't go out in the sun much," Melamed said.