Now, to clear up another side-note...
The pyramids were built by highly skilled and respected laborers that had their own quarters in the city nearby, and who were eating high quality food (including meat, which would never be given to slaves). The laborer's quarters were located some years ago, and evidence of their diet and lifestyle has shown the obvious:
It takes some pretty mean skills with stone working to actually build a pyramid, and no one has their most impressive monuments built by people who don't care about what they are doing.