Everyone's definition of abstinence is different. OA has no established food plan, even though most members follow similar plans. NO ONE has the right to tell you what to eat. If you've been talking to a person about being your sponsor and you are not comfortable with what they're telling you, you can find another sponsor. The
only requirement for attending OA meetings is a desire to stop eating compulsively. It sounds like you have that.
You might do a search in these pages, we've discussed our own abstinences before. There are some good thoughts.