According to Psychiatry Research Nueroimaging Medical Journal – Mindfulness practice leads to increases in regional brain gray matter density!
This means that MEDITATION LITERALLY REBUILDS BRAIN TISSUE THE WAY WEIGHT-TRAINING BUILDS MUSCLE!
~ Anthony
You can find the research paper at the following link: http://www.psyn-journal.com/article/S0925-4927(10)00288-X/pdf