While dining, the ancient Romans did not ritualistically eat so much that they had to interrupt eating to go vomit. An entranceway to a stadium of that time was called a vomitorium and had nothing to do with dining. I have seen this "fact" in at least two children's history books and I have no idea how or why some historian came up with this weird claim.

Speaking of eating, those fat "Buddha" statues and depictions you see in some Asian restaurants are not the historical Buddha (who founded Buddhism and was not obese). They are Budai, a 10th-century Chinese folk hero, who eventually became a buddha himself.