Its all about the "gut"

I always wondered why people rely on the gut for any intuition and where on earth this term "gut feeling" originate. The funny part is that the term "gut feeling " is normally used to predict about an incidence, providence, which I would associate positively as there in a normal course - a person would that extra bit to of sixth sense to predict the future or give an indication of a likely outcome of the situcation/scenario/circumstance as otherwise this divine power doesnt come naturally. Medically "Gut" is assciated with digestive tract and to sound politically correct the waste is stored there, then how come such a positive emotion is associated with the "gut". I wish to imagine if the gut can give such powers what about the other important parts .like the "liver power" , " pancreatic emotion" etc

As a corollary even acts of bravery/defiance is associated with "guts". I will not elaborate as it is well understood.

Have not been able to find anything historically which will give such an importance to a body part which is internal and stores the waste matter. It should be typically associated with catharsis or letting out of emotion. Sometimes even though the words dont mean the obvious - it becomes so ingrained in our daily lingo that we start using even without realising what it could mean otherwise.