Harvard neuroscientist: Meditation not only reduces stress, here’s how it changes your brain

But I bet your doctor doesn't have this as a stroke protocol.
http://www.washingtonpost.com/news/inspired-life/wp/2015/05/26/harvard-neuroscientist-meditation-not-only-reduces-stress-it-literally-changes-your-brain/?
A couple of lines from there. Why the hell doesn't your doctor know about this? And prescribe this? Are they that clueless?

We found long-term meditators have an increased amount of gray matter in the insula and sensory regions, the auditory and sensory cortex.

 We also found they had more gray matter in the frontal cortex, which is associated with working memory and executive decision making.

Q: So how long does someone have to meditate before they begin to see changes in their brain?
Lazar: Our data shows changes in the brain after just eight weeks.