Out of curiosity i just googled the Minnesota Starvation Experiment, where men were put on an extremely low calorie diet (1600 calories, when their maintenance was 3200) for 6 months. The results, after they were allowed to go back to eating in unlimited quantities, was that they binged until they gained back all their weight PLUS 10%. But then 9 months later, their weight had returned to their pre-experiment weight.
I think that study is illustrative. I do question, however, whether the findings would apply equally to overweight people. The people in the study were of a normal weight (normal in 1940...which is different than "normal" now)
Trying Intuitive Eating! Want to be happier and have a healthy relationship with food