dude, if you really want to lose weight, Pilates ain't gonna do it.
Here's some tips: Run. Run. Run.
To quench those cravings for sweets and any kind of hunger: drink lots of diet soda. It will give you a sense of fullness(moreso than anything else you can ingest) -with zero calories.Keep busy so you don't munch on things (at work, at home, and so on). Obvious-don't buy any junk food. Eat out as rarely as possible.
These rules, and a diet low on fat, high on fiber and vitamins is what helped me lose weight. Really fast. Really easy. I think people who complain they can't lose weight are...well, only world I can think of is inferior.
Waiting for the flamefest