Exercise as addictive as heroin

Excessive exercise can be as addictive as heroin, according to US scientists, and stopping can lead to withdrawal symptoms. The scientists believe that extreme exercise causes increases in endogenous opioid peptides (endorphins), which act in the brain a manner similar to chronic administration of opiate drugs. The psychologists observed a group of rats, some of which exercised excessively on a wh ...

• • Please note that: the most twenty most recent research abstracts are free to view but access to the thousands of items in the archive require a
    journal subscription
    .