This should be tacked to the "Humans were not meant to eat meat" thread.
The research I have done is inconclusive. It seems that as a general rule meat is more difficult to digest than vegetables. This seems to be due to the saturated fat content, which makes meat harder to digest. So lean meat is easier to digest... and meat that is not cooked too much (this would seem right in evolutionary terms if humans only recently started cooking meats, right?).
However, there seems to be lots of non-meats that are difficult to digest too - things like legumes, broccoli, potato, pasta.
My question is "is it easier for humans to digest meat or vegetables"? or is there no general rule? If there was no general rule, it would seem to lend support to the idea that humans have evolved as omnivores, would it not?
A supplementary question is does pork take the longest of all the meats to digest?