Why Do I Do This?

I weighed myself this morning out of curiosity. I know I shouldn't do this because it always discourages me, but I did. I was up a pound. I was crushed because I have been so good. My only hope is it is water weight from the chinese food I ate last night, it is loaded with sodium. So I will try to flush it out today by doubling my water intake.

So, why do I do this to myself?