据中国妇婴保健中心的调查表明，我国育龄妇女体内叶酸水平较低，缺乏率是北方高于南方，农村高于城市，春冬季高于夏秋季，其分布形式与神经管畸形发生率的分布完全一致。因此，孕妇叶酸的缺乏与神经管畸形有一定的关系，造成叶酸摄入不足的原因有：１膳食中摄入量低一般来讲 According to the survey of China’s Maternal and Child Health Center, the level of folic acid in our country’s women of childbearing age is relatively low. The lack rate is higher in the north than in the south and higher in the countryside than in the cities. The spring and winter are higher than those in summer and autumn. Exactly the same. Therefore, the lack of folic acid in pregnant women and neural tube defects have a certain relationship, resulting in inadequate intake of folic acid due to the reasons: 1 diet intake is low in general