bargoo, I think rachelfern means she only had one piece of pie on Thanksgiving.
And that's a good thing.
Rachelfern, good for you for catching yourself now, before you gain any more back.
It doesn't matter what anyone else "can" eat--the only thing that matters is what you can eat to lose weight or at least not gain. As you've just noticed, it's harder to do that than you might have thought.
Many 3FC members track their eating using FitDay or TheDailyPlate or some other online tool. But whether you use them or not, it really does help to track what you eat exactly. Many folks have found that "not watching exactly" what they eat means that they gain weight, until they have had some practice at it.
Good luck!
Jay