liposuction

Almost 400,000 men and women undergo liposuction every year to remove excess body fat from their bellies, buttocks, or wherever it happens to be deposited. This improves their looks, their self-image, and even their weight. Unfortunately, however, it does not correct the abnormal chemical profile associated with obesity that predisposes to other diseases. Diet and exercise remain the most effective ways to do so.

It's possible this procedure leaves too much body fat behind, the deeper fat not accessible to liposuction. It may be the dangerous kind, rather than that which is superficially located and surgically removable. It may also be fat cells must shrink in size, not just in number (dieting does make fat cells smaller to improve one's health.) The body needs to run an energy deficit through diet and exercise in order to result in better body chemistry profile. Whatever the reason, simply eliminating the fat tissue by liposuction doesn't really reduce vulnerability to disease, at least over a short term. Extra fat is a threat to our health. In a real and measurable way, being overweight predisposes us to diabetes (with all its complications), premature heart attack and stroke, and even cancer.
by Isadore Rosenfeld, M.D. "2005 Breakthrough Health"