The obesity epidemic across the United States and the rest of the world has led to many programs centered on lowering Body Mass Index (BMI) for the well-being of the individual. However, significant amounts of weight loss cannot ignore the physics of the real world. Bodily entities like the skin and fat deposits that have made huge changes in tension and size from the loss of volume do not always adjust themselves accordingly after weight loss. Bariatric (weight loss) surgery has caused many individuals to meet their BMI goals and develop healthier lifestyles, but it has also created the need for much of the body contouring necessary from weight loss.
As individuals metabolize their fat, they begin to not only weigh less but also occupy much less physical space. This loss of volume, especially when rapid, is not responded to by the body. In most cases, severe and swift weight loss results in loose skin and fat that literally hangs off the body because the mass upon which it rested has been suddenly removed.