Dr Philippe De Wals of Universite Laval compared the prevalence of neural tube defects before and after the introduction of folic-acid enriched flours for over 2 million births in Canada between 1993 and 2002 and found that addition of floic acid to flours has led to significant drop in the incidence of neural tube defects in Canada. He said that it is better to integrate folic acid into the food chain than focus on taking vitamin supplements.
The study "Redudction in neural-tube defects after folic acid fortification in Canada" is published in NEJM, July 12, 2007, no.2; 357:135-142. Read more....
Currently only Canada, USA and Chile implement folic acid fortification in flour. Folic acid in the UK is unresolved.
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