There’s been a lot of research on meditation that supports the ancient teachings. Robert Sapolsky, Professor of Biological Sciences and Neurological Sciences at Stanford University has coined the term “adventitious suffering” – the mind generated pain of ruminating on what did happen, will happen, and might happen. And if you are a human suffering from adventitious pain and you do it for a long time, it is highly likely that disease will arise. There is a long list that describes the effects of long-term psychological stress, some of which includes weakened muscles, increased blood pressure, a suppressed immune system, depression due to the depletion of dopamine, and much more.
Meditation can strengthen our ability to regulate the stress reaction. Long-term meditators have strong immune systems, increased activity in the prefrontal cortex of the brain (happiness center), an increase in synchronicity with other parts of the brain during meditation, increased clarity, increased ability to heal, and reduced cortisal throughout the day. A consistent practice of meditation increases well-being on every level. It builds inner strength, develops internal resources, and acts as preventive medicine.