More than 60 percent of U.S. women of childbearing age are overweight or obese -- a significant increase from 20 years ago. And recent studies strongly suggest that either too much or too little nutrition in utero can increase a fetus' chance of becoming an overweight child and overweight adult.
Such data on the increasing girth of pregnant women and the growing rates of obesity in children led to pressure on the Institute of Medicine of the National Academies to revise 1990 guidelines that were written primarily to prevent the birth of excessively small infants. Link
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