Hanging upside down for too long can cause medical problems. Blood starts to pool in places where it shouldn’t be, including the head and the lungs. The excess blood on the brain can lead to a stroke.
Can you eat upside down? The answer is yes although it is not recommended to try. Our esophagus muscles still contract and will pass the food to our stomach.
Can you urinate when upside down? Again the answer is yes, although again it will likely not be a good experience.
A magician named David Blaine has a claim that he hung upside down for 60 hours, however during this time he came down for 5 minutes every hour. He said the “enormous push of blood” made him feel like his head was “about to explode”.