Why would you say that when you absolutely can't prove it?everyone has the same length of intestine.
Here is a quote from Sheldon's 1968 paper "Psychotic Patterns and Physical Constitution. A Thirty Year Follow-Up of Thirty-Eight Hundred Psychiatric Patients in New York State.
"Later in medical school, my attention was called to the fact that a number of investigators - notably Bean, Bryant and Goldthwait - had reported that both intestinal mass and total length of the gut tended to VARY GREATLY in different people. Some persons, often called herbivorous types, had been found at autopsy to have a total gut length of forty feet or more; while others, called carnivorous types, measured around fifteen feet. I was permitted to test this observation by assisting as "measurer" at thirty autopsies. We had seventeen "herbivorous" and thirteen "carnivorous" cases. The mean total length for the former turned out to be 32 feet; for the latter, 19 feet. The longest gut was 43 feet; the shortest, 14 feet. Better than a three to one ratio. Again, something was there. This time something pleasingly substantial. Forty three feet of it. The constitution problem began to seem worth looking into."