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Too little sleep may fatten kids

As childhood obesity reaches epidemic proportions, parents who are concerned about their children's weight might want to encourage an early-to-bed policy. A new study finds that among the primary-school set, losing sleep is linked with gaining pounds.

Earlier studies had correlated weight with sleep patterns but inevitably raised the question of "which came first, the chicken or the egg," explains Julie C. Lumeng of the University of Michigan in Ann Arbor, who led the new study.

Her team questioned the parents of 785 children from all over the United States about sleep patterns when their kids were in third grade. Three years later, they questioned the parents again.

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