Meditation evokes many physical changes. For instance, meditation lowers cortisol production in response to stress, reduces sympathetic nervous system activity, and increases parasympathetic activity, which induces a calming effect.
In addition, meditation reduces the body's oxygen consumption, increases positive neurotransmitters such as serotonin and endorphins and increases alpha brain waves. For immune system health, meditation increases immune responsiveness and reduces pro-inflammatory cytokine molecules.
Meditation halts stress, reduces energy consumtion and allows energy to regenerate. On a molecular level, meditation causes changes that promote DNA repair.