How is Fat Discharged from the Body?

When patients lose weight, their fat is metobolized away. The body uses the fat as energy when it doesn't get enough calories. It is not excreted in any way.
When urine fat is measured after mesotherapy, there is no fat there, hence my scepticism of the metabolic explanations of how fat "disappears" from the body after mesotherapy. There is good evidence that it is eaten away by macrophages, the scavenger cells of the body, over a long period of time, and then metabolized. Hence the prolonged lumpiness and pain in many patients.
When liposuction is performed, the fat is removed directly and put into a bucket of medical waste.
Being morbidly obese can actually cause nonalcoholic steatohepatitis, or damage to the liver. this tends to improve as people lose a lot of weight, so losing weight is probably actually good for the liver.

Thank you for your question regarding how fat is removed during liposuction and what happens to it afterward.

During liposuction, fat is removed from the body using a cannula—a thin, hollow tube that is inserted under the skin. The cannula is connected to a vacuum that suctions out the fat as the surgeon moves it back and forth through the fat layer. This technique allows for the precise removal of excess fat, sculpting the area to achieve a more desired contour.

Once the fat is removed during liposuction, it does not return to your body. Instead, the fat cells are permanently disposed of. Typically, the extracted fat is considered medical waste and is disposed of according to medical waste regulations. In some cases, if a patient is undergoing another procedure like a fat transfer (for instance, for a Brazilian Butt Lift or facial fillers), some of the harvested fat can be purified and reinjected into areas where volume enhancement is desired.

Regarding your question about how the fat leaves your body as waste and whether it is damaging to the liver: in the context of liposuction, the fat does not go through your body’s metabolic processes; rather, it is physically removed and discarded. Therefore, it does not affect the liver or other body processes related to the metabolism of fat that is naturally digested through dietary intake.

Liposuction should not affect your liver or other organs because it is a mechanical removal process, not a biological one. The body's natural processes for dealing with fat primarily deal with fat that is ingested and metabolized for energy. Since liposuction removes fat cells directly from the tissue, this bypasses the body's internal metabolic processes.

It’s important to maintain a healthy lifestyle after liposuction, as the remaining fat cells in your body can still expand if a consistent, healthy weight is not maintained. Regular exercise and a balanced diet are crucial to support long-term results of the procedure.

If you have any more specific concerns about the procedure and recovery, discussing them with your surgeon will provide the most tailored and accurate information.

Sincerely,
Dr. Katzen

Any dead fat cells that remain after liposcution will be broken down by enzymes discharged by the white blood cells and then removed by the lymphatic system.  There is no harm to the body that I am aware of.