缺乏叶酸是美国最常见的维生素缺乏症，但食素的妇女比食肉的平均叶酸食用量要多。
Deficiency is the most frequently encountered vitamin deficiency in the U.S., but vegetarian women consume more folic acid on average than meat-eaters.
当你准备要一个孩子的时候，你要开始做产前检查，每天服用至少含有400微克叶酸的多维他命剂。
Start taking a prenatal or multivitamin containing at least 400 MCG of folic acid per day as soon as you know you're ready for babies.
有怀孕计划的女性应该提前补充叶酸，一般要提前3个月。
Pregnant women should have planned ahead of folic acid, generally 3 months in advance.
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