Now, I wonder if I really read it. However, I have found no research that supports this conclusion either . This also appears to be a humor legend. However, this research is limited in several ways. Many appear to have design flaws such as lacking adequate control or comparison groups.
Laughter clearly effects our physiology.
We know heart rate increases, blood flow increases, muscles convulse, and probably hundreds of biochemical changes occur. What's not clear is the exact nature of the biochemical changes. The data is unclear. We feel good when we experience humor. Humor practitioners report that humor changes emotional states.