Pregnant women who are overweight could be condemning their children to a lifetime of obesity unless they trim down while trying for a baby, U.S. experts say.
Researchers from medical centres in New York and Quebec found an obese mother's womb may send a signal to their unborn baby that encourages them to grow into a fat child and adult.
The process is more than just passing along genes that promote obesity but the scientists said they have yet to track down a biological explanation for the signal.
Robert Waterland of the Baylor College of Medicine in Houston studies the effects of obesity in mice.
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