Research has proven the brain can reorganize itself with Mindful Meditation.
In one study by Sara Lazar, MRI revealed that experienced meditators had a thicker cortex than non-meditators. This was particularly true for brain areas associated with attention, interoception and sensory processing.
A study showed increase in grey matter in the brainstem which influences cardiorespiratory control. An another showed increase grey matter in the hippocampus which is associated with emotional regulation and response.
Read the linked article for more information.