Wow 80 lbs is a great accomplishment. Now hold your focus very carefully, don't let up on the exercise. You've just entered a very tough time in this game. I think if you can keep it at this weight for 3 or 4 years you'll have a very good chance to keep it for a lifetime.
Congratulations-- I am so happy for you- What an accomplishment - I hope you post some before and after pictures -- Your achievement motivates me to stay on plan