The Obalon system is a pill that has a balloon inside. Obalon is a weight-loss device, marketed as an alternative to bariatric surgery, that claims to help people eat less and "push back from the table sooner."
Obalon begins to work when you swallow Obalon and it lands in your stomach. Obalon remains temporarily attached to a thin tube, through which doctors can inflate it. They then remove the thin tube, and the balloon stays in your stomach for up to three months, bobbing around like buoy in gastric waters. You can take up to three at a time, the manufacturers say.
The idea is that balloons partly fill your stomach to make you feel full, so you eat less. They are too big and buoyant to pass beyond the stomach. After twelve weeks, a doctor deflates the balloons and pulls them back out through your mouth.
Source: theatlantic.comAdded: 5 February 2014