I see you're following Suzanne Sommers, so I'm pretty sure grapfruit juice is OK. If you were on Atkins or PP it would be a No-No. You might want to pull out your copy of the Sommers book and do a quick re-read. The comments made on here tend to be from people following a much stricter low carb program than you're on, it might be confusing.

I also noticed you're in Ottawa. Hi Neighbour!
Nat