The term bulimia is originally derived from Greek words "bous", meaning head of cattle, and "limos", meaning hunger, therefore suggesting an appetite like that of an ox. Though vomiting after overeating has occurred for thousands of years, bulimia was only first recognized as a disorder in 1980 in the DSM-III. Minor revisions of the diagnosis have been made since, most significantly the addition of two subtypes, purging and non-purging type, in order to highlight the clinical differences between the two populations.