Pregnant women who take folic acid supplements can substantially reduce their baby's chances of being born with a cleft lip, say researchers from the National Institute of Environmental Health Sciences (NIEHS). They found that just 0.4 milligrams (mg) a day of folic acid reduced by one-third the baby's risk of a cleft deformity. In the U.S., about one in every 750 babies is born with cleft lip and/or palate. "These findings provide further evidence of the benefits of folic acid for women," said Allen J. Wilcox, the lead researcher of the study, published in the British Medical Journal. "We already know that folic acid reduces the risk of neural tube defects, including spina bifida. Our research suggests that folic acid also helps prevent facial clefts, another common birth defect."
Folic acid is a B vitamin found in leafy vegetables, citrus fruits, beans, and whole grains. It can also be taken as a vitamin supplement, and it is added to flour and other fortified foods. The recommended daily dietary allowance for folate for adults is 400 micrograms or 0.4 mg. The new study was conducted in Norway, which has one of the highest rates of facial clefts in Europe and does not allow foods to be fortified with folic acid.
The researchers examined the association between facial clefts and mothers' intake of folic acid supplements, multivitamins, and folates in diet. The researchers found that folic acid supplementation of 400 micrograms or more per day reduced the risk of isolated cleft lip with or without cleft palate by one-third, but had no apparent effect on the risk of cleft palate alone. "Folic acid deficiency causes facial clefts in laboratory animals, so we had a good reason to focus on folic acid in our clefts study," said Wilcox. "It was one of our main hypotheses."
Source: National Institute of Environmental Health Sciences
