大家怎么没有人讨论我提出的谷物产品里添加叶酸的问题？

添加叶酸就可以减少脊柱裂也就减少了需要肖氏手术的必要
性。 美国和英国就是这样做的。英国是脊柱裂发病高的地区
中国的华北据说也是这样。 要预防脊柱裂怀孕的头两个星期
补加叶酸是关键，但怀孕两个星期的时候孕妇可能还不知道
自己怀孕了所以谷物产品里添加叶酸就非常有好处

http://en.wikipedia.org/wiki/Folic_acid

Since the discovery of the link between insufficient folic acid and neural tube defects (NTDs), governments and health organizations worldwide have made recommendations concerning folic acid supplementation for women intending to become pregnant.

This has led to the introduction in many countries of fortification, where folic acid is added to flour with the intention of everyone benefiting from the associated rise in blood folate levels. This is controversial, with issues having been raised concerning individual liberty, and the masking effect of folate fortification on pernicious anaemia (vitamin B12 deficiency). However, several western countries now fortify their flour, along with a number of Middle Eastern countries and Indonesia. Mongolia and a number of ex-Soviet republics are amongst those having widespread voluntary fortification; about five more countries (including Morocco, the first African country) have agreed but not yet implemented fortification. To date, no EU country has yet mandated fortification.[69]