Here's the best recipe I've found so far for screwing up your diet. Ready...
1) Go to Zumba after a grumpy day at work and annoying traffic
2) Have a new Zumba teacher
3) Be very very annoyed by new Zumba teacher
4) Be so annoyed by new Zumba teacher you walk out after 25-ish minutes
5) Feel grumpy, annoyed, and pathetic for yourself
6) Because you are feeling so grumpy, annoyed, and pathetic stop at Burger King for dinner
7) Order a double cheeseburger, fries, Dr Pepper, and a milkshake
8) Eat that ridiculous amount of food
9) Feel even sorrier for yourself
10) Go to bed early because you're now feeling grumpy, annoyed, pathetic, and fat