Congratulations! Doesn't that kind of thing feel great? I had a similar situation happen to me when I went out with my friends one time. They wanted to eat out and I didn't really wanna, but I still wanted to shop with em. So while they ate their yummy burgers and fries, I just sat and drank water haha. I never thought I could do something like that, but I guess my will power was pretty strong then. And I felt great after too.
Anyway, grats! I'm sure you definitely wont miss those 300-400 calories!