"During the past two decades, the lifestyles and dietary habits of Americans have changed considerably. The average American spends 93 percent of his or her time indoors5—more time spent in front of the television, the video game console, or the computer. Children with lighter pigment who are encouraged to play outdoors often are covered with sunscreen during the summer months, preventing the synthesis of previtamin D3 in their skin 6 and making them more susceptible to vitamin D deficiency during winter months, especially in northern climates. Children with darker pigment require much greater sunlight exposure to attain the same levels of vitamin D3.7"
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