I was just reading about urban agriculture, di you know community waste was used in ancient Egypt to feed animals on the farm?
Wow that's interesting.Don't the animals catch disease?
Quite possibly. It wouldn't surprise me if people fell sick, too, as the food was distributed around villages, towns and cities.
One thing they say is that civilization started from Egypt, so you never know they might have found a way to sterilize the food that is not recorded. 
That's very true. It is argued that ancient Egyptian culture was influenced by afroasiatic speaking populations in North East Africa.