I'm stoked you've started down this path because it's so worth it. I think you know the answer, but thought I would second what you're already thinking and that is yes it takes time for your body to adjust. The first week is usually all water weight loss, then you get down to the nitty-gritty.
It takes years to do the damage we do and we can't expect to fix it over night so be patient and do your thing and it will fall into place- trust me!
Self-realization. I was thinking of the immortal words of Socrates, who said, "... I drank what?"