Researchers randomly placed teens, who were either deficient or insufficient in vitamin D, on placebo or vitamin D-3 supplement for six months and found that obese teens were only about half as efficient at taking vitamin D compared with lean teens. The findings indicate that 4,000 IUs are needed to raise the vitamin D status of obese teens, and that "if obese adolescents only consumed the recommended 600 IUs, they would be in trouble," study researcher Catherine Peterson said. The study was presented at an Experimental Biology meeting.

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