What about a device that counts the number of times I take a dump and tell me if I'm having satisfactory bowel movements?
And as a bonus, it can also tell me the turds' quality.
It seems to me that the worst food most people eat is probably finger foods... Apart from cake and pie I can't think of many foods I eat with a fork that I would really want to worry about my eating habits with...
Try eating potato crisps with this fork. You will be so frustrated that you won't manage more than a few calories per hour. Hapilabs might be onto something.
Otherwise $99 buys a few largish mirrors that, strategically placed around your pad, will probably work better to dissuade you from overeating.