Lily's right - be kind to yourself - being mean to yourself isn't going to solve anything - and all you did was eat which is a fairly basic human desire... it would be more helpful to see what you can learn from it..
If you were eating when you weren't hungry, what were the reasons you were eating?
If you were in the same situation again, what would you like to be different about the way you respond? what support would you need to make that possible?
Are there good reasons why it was different? or is this a situation you will face again, and so would benefit from developing a strategy to deal with it?
- don't be mean to yourself - get planning instead - and learning xx it's better to have a slip and truly learn from it, than have a slip and let it turn into something bigger than it really needs to.. all you did was have something to eat that you didn't plan to.. there are worse crimes going on in this planet xx