It was probably primarily water weight loss, and will almost certainly come back on when you start to eat properly again. Initially, the body will lose weight... water and muscle are the first to go, but over time, you will almost always wind up overeating because we are programed to want food. It is this that technically will cause weight gain following a pattern of restrictive eating in most people.
The better question is why did you spend two weeks starving yourself?
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