[logos]

People do "Atkins" in a number of different ways. Some of those ways could easily involve a diet low in folic acid, which is needed to prevent a certain kind of birth defect and is the reason for pre-natal vitamins. It might predispose to this type of defect.

While i'm not sure if its a good idea to even try to conceive on Atkins, it seems that it would be important to be on pre-natal vitamins before trying (which is advisable for any woman given that the kind of birth defect that folic acid prevents typically occurs even before the woman knows shes pregnant...).