What's the deal?

I was so hungry last night for supper I had a bologna and cheese sandwich and some chips and dip and I didn't throw up. What's the deal? I guess this is where I really need to keep focused and exercise. In the back of my mind I thought, oh my body will just keep losing until I am down to 150 and then I will have to work a bit harder, but NOOOOOOO, that isn't how this is working. I need to rearrange my thinking here!!! I must!!