So, it does not matter what physiological effects may be triggered by the lose of blood. Someone has already decided to label "bloodletting" as "unscientific",

So, it does not matter what physiological effects may be triggered by the lose of blood. Someone has already decided to label "bloodletting" as "unscientific", so no person that sees themselves as rational may investigate the phenomenon ever again? In the words of the immortal Professor Quirrel (of HPMOR fame): "So the nasty Italian fascists believed that unity is stronger than division. Perhaps they also believed that the sky is blue, and advocated a policy of not dropping rocks on your head."