I too had gastric bypass in 2000 and was very successful, I lost 150 lbs. I gained alot (most) of it back in the last few years when my husband got sick and we were in the hospital for a year before he's gotten better. Thank God!
I'm now trying to go back to eating healthy and want to lose the weight. It's harder this time because the weight's not coming off as fast as it did. It's coming off and I have tons of energy though!
This site has been very helpful with the food tracking and all the other cool tools they offer.
Good luck to you!