Liposuction is not a technique for losing weight, but most people will lose some weight if enough fat is removed.
Liposuction is an excellent technique for contouring the shape of the body. It is not a treatment specifically to lose weight. However, fat does weigh a certain amount, so you will theoretically lose a certain amount of weight proportionate to the amount of fat removed.
A half liter of fat weighs roughly one pound. To put this volume in perspective, think of a 2 liter bottle of cola. So, if 2 liters are removed, you would lose 8 pounds.
The amount of fat removed during liposuction depends on how much fat there is in the area(s) to be treated. A mid sized abdomen in someone who is close to their ideal body weight may have about 1 to 1.5 liters of fat that can be removed.
You may not appreciate any weight change immediately after liposuction, though, because there is swelling after liposuction. The fluid retained by swelling weighs a certain amount, too . Most swelling after liposuction dissipates after 6 – 8 weeks.