To the Editor: With the recognition that supplements of folate given early in pregnancy can reduce the incidence of neural tube defects,1,2 Australian manufacturers were allowed voluntary food fortification with folate from 1995, and these foods subsequently became available from August 1996. We assessed the impact of this fortification by comparing the results of assays of serum folate, a sensitive index of folate intake, before and after the introduction of folate-fortified foods.
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