For some, the biggest challenge of reaching a healthy weight isn't adjusting their diet or getting more exercise -- it's resisting pangs of hunger when they've already eaten enough. They might have a better time resisting that urge after today, as the US Food and Drug Administration has approved a first-of-its-kind appetite controlling device, EnteroMedics' Maestro Rechargeable System. Think of it as a pacemaker for your stomach. The device sits just under your abdomen and sends electrical pulses that both block hunger signals and send fullness signals more often. In theory, you'll lose weight simply because you have a better sense of when to stop.