I have seen one that is ADVERTISED to let you be able to eat more, its called the black hole or something.... but i agree with sarg, just eat more frequently and your body gets used to that and will crave food every couple hours.
Honestly, I am not flaming, it is called "Don't be a bitch and just eat" ...from the same company who makes the cutting supplement "Don't be a bitch and just stop eating so much"....lol....seriously, it is tough at first, but as said, you can train yourself to eat more just as you can get used to eating less.