Back in San Francisco, Li realized that the beta-endorphin he had isolated contained ... allowed neuroscientists to conclude that the brain has receptors for painkillers which the pituitary ...

This suggests that the increase in opiate receptors in the brain is an adaptive response ... The notion of enhancing the natural opiates in the brain, such as endorphins, as a response to pain, seems ...

These endorphins interact with the receptors in our brain that reduce our perception of pain and trigger positive feelings in the body. Exercise also helps to reduce cortisol, the hormone ...