Runner?s High Is A Lot More Complicated Than We Thought
 

Runner?s High Is A Lot More Complicated Than We Thought
http://img-s-msn-com.akamaized.net/t...6&q=60&o=f&l=fIt turns out that the runner's high isn't just thanks to endorphins. The hormone leptin, which is more commonly associated with appetite, might also come into play, according to a new study in mice.