Researchers are discovering the relationship of calories and weight is far more complicated than the accepted standard of 3,500 calories per pound. The body appears to adjust to the impact of more or fewer calories over time, raising questions about current weight-control efforts. "If it does take more than 3,500 calories to lose a pound or not gain a pound, then it makes it all the more important to change the food environment," said Lynn Silver of the New York City Health Department.

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