"I do not eat them."
Translation:Io non le mangio.
This is purely an educated guess, but since we have no idea what "them" could be, we would just have to call them a "thing" which would be "cosa" (i.e. feminine noun). Since this is plural it would be cose => le (direct object pronoun).
This came up when I learned Spanish, and that was how it was explained to me. If you don't know what the noun is, just assume it is a "thing" or "cosa" and make it feminine.
However, I could be totally wrong, so if there are any native speakers or advanced learners who have a better answer, please let us know!
well, "gli" is an indirect pronoun,(male singular form) while we have a direct pronoun in plural form. At this link http://italian.about.com/library/fare/blfare165a.htm there is a list of direct italian pronouns. Example with "gli" as a pronoun: "io gli chiedo" ->"I ask him"