Inaka_Nezumi t1_jeer6xw wrote

Dietary recall is a bit of a hit and miss way of assessing intake of a vitamin and is open to biased interpretation. Vitamin K MK-4 is taken up rapidly by the brain, Vitamin K MK-7 found in hard cheeses and Natto products doesn’t cross the blood-brain barrier. So, other studies would need to follow it up with set dose supplemented vitamin K of the same type, to get a more reliable result.