"When you eat an unripe banana, its serotonin is free to act upon the serotonin neurons within your digestive tract. The consequence is...usually experienced as diarrhea."

This made me curious, so I googled it. The very first result is a scientific study demonstrating that unripe bananas are a great remedy for diarrhea: http://www.worldchiropracticalliance.org/tcj/2000/aug/aug200...

I stopped reading the article after this, fearing that the author did not do his homework.