Did you know that meditation activates the prefrontal cortex ( higher thinking) and releases neurotransmitters, including dopamine , serotonin , oxytocin , and brain opiates? Dopamine is a antidepressant ; serotonin increases self esteem ; oxytocin is a pleasure hormone ( released during sex); opiates are the body's painkillers and also provide a runner's high. This has been linked to happiness . No single drug can simultaneously release all these chemicals. To start 2013 off healthy and happy learn to meditate. It is a gift to yourself. Source: Deepak Chopra