As I have explained to my wife, the best way to lose weight is to put down your eating utensils after every bite and wait until your mouth is empty before you pick them up again. This approach keeps you from shovelling in food and it will keep you from eating long after your body tells you it is full.
Though I have to admit, after you spend $800 on this thing, you are not going to be able to afford as much food as you could have using my method.
Just a thought.
It needs some kind of interface so you can tell it what you're eating or drinking. That way you get credit for drinking water instead of Mountain Dew or eating health food instead of Taco Bell.