Slip ups (lapses and relapses) are part of any behaviour change cycle in anything from giving up heroin to stopping biting your nails. The biggest mistake is to have a slip up then think "oh well, I've blown it now... not much point trying any more". That thought really doesn't make much logical sense when you subject it to the light of day but it's behind pretty much every so-called "diet failure".
If you can, get the word "failure" out of your head. No such thing. I don't give a hoot if you've pigged out on your body weight in chocolate, chips and pizza, it's not a failure. It's a learning opportunity. What happened? What was it that led to that behaviour? Follow that all the way back to when it first started coming off the rails, then learn how to spot and intervene at that point.
Sooooo many people get caught in the "but I was in KFC and the chicken smelled so good..." without asking themselves "what was I doing in KFC?"... because my friend asked me to come. Why didn't you say no?... because I needed some friend time. Why was that? .... because I felt bad. Why was that?... because I'd had a fight with my boss....
etc. In that example, the emotional stuff could have been handled differently, or a suggestion could have been made to the friend to go somewhere else... i.e. you intervene BEFORE getting to KFC where the chances of your willpower holding out are next to nothing. It might be behavioral (my route home goes past my fave takeaway) or cognitive (I feel so shitty, I need a block of chocolate to cheer myself up).
THEN you forgive yourself for being human and make a plan to better handle that situation next time. Then you implement it. Then you slip up. Then you learn from it for next time and make a plan. Then you slip up... etc
In summary - KEEP AT IT. It's better to walk for a lifetime than run for a day, so just keep plodding along. You'll get there.
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"