Originally Posted by mrsD

Here is a video illustrating how a "hidden" and misunderstood deficiency which can affect young people as well as older people commonly (up to 40%).

Vit B12 deficiency can cause shrinkage of the brain and spinal cord as it results in demyelination of nerve axons.

http://www.youtube.com/watch?v=BvEiz...ature=youtu.be

This is a long video, and does not go into some other features of supplementation. I have further information on this link:

http://neurotalk.psychcentral.com/thread85103.html