You often see Ancient Greek art depicting men with very well toned muscles. How did they achieve such high volumes of muscle mass given their, what we would consider today, limited diet? Or are the depictions of men from Ancient Greece just exaggerated representations of what their ideal of a man should look like?
Although it doesn't address diet, this earlier answer by u/Iphikrates, which discusses ideal athletic body types in Greece, may also be of interest:
https://www.reddit.com/r/AskHistorians/comments/46guc3/gym_rat_here_how_ripped_did_ancient_greeks_get/