I Accept the Theory of Evolution

Unlike other primates, humans walk on two legs (bipedalism). Gorillas, chimps, bonobos and orang-utans amble about using their feet and their knuckles (quadrupedalism). However, moving around on four limbs can be inefficient. On open ground, bipedalism bestows an evolutionary advantage by allowing humans to move much faster than other primates, but that comes at a cost (with evolution, there are no free lunches)

The intestines and other visceral organs are held together with thin sheets of connective tissue called mesenteries. Mesenteries are elastic and act to keep the gut loosely in place. Because we are bipedal, with an upright posture, these thin sheets should be suspended from the top of the abdominal cavity. Instead, they are attached to the back of the abdominal cavity. That makes sense for the other quadrupedal primates, because their gut is then well-supported when they walk on all fours. However, it makes no sense for us… unless we evolved along with the other quadrupedal primates.

Because of the stress of supporting our internal organs from the back, the mesenteries can easily tear, causing internal haemorrhaging and damage to our gut, requiring surgical intervention (this is a common injury in traffic accidents… mainly affecting those stupid enough not to wear a seatbelt). It can also happen to people who sit for long periods of time (drivers, office workers, etc) simply because of the stress and strain of the gut being attached to the back, rather than the top, of the abdominal cavity.