
Thanks Barbara!
Of course most people don't know what DS is. Stupid of me.
It's supposed to be very much related to spina bifida in human babies. And that's something which is proven to be avoided, more or less, by the mother taking Folic Acid as supplement before getting pregnant and during the first trimester. When this was first studied, mothers with one child with spina bifida participated. One half got Folic Acid, the rest placebo. It turned out they had to stop the study in advance, since it became very clear early on that the benefit of Folic Acid was proved. It wouldn't have been ethical to deprive mothers of something that would obviously keep their next child healthy, just to complete a study.
In the USA the flour is supplemented with Folic Acid. It's been discussed here too. But it's supposed to increase the cases of cancer in the bowels, in older people. So the goverment decided against it.