Pregnant women should take folic acid, a B vitamin, during pregnancy to prevent neural tube defects in their babies. Now a new study, in JAMA Pediatrics, has found that sufficient folic acid during pregnancy may reduce the risk for obesity in children.

Researchers studied 1,517 mother-child pairs, measuring the mothers’ folic acid blood levels at delivery and following the children through average age 6. After controlling for other variables in both mother and child, they found that compared with those mothers who had folic acid levels in the highest three-quarters, those with levels in the lowest one-quarter had a 45 percent higher risk for obesity in their children.

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