The blood will not be completely purified after fat loss; the amount of fat in the blood will be appropriately reduced after fat loss, but other blood components will not change with it. Fat reduction is the behavior of losing excess fat from one’s body through various means when the body fat exceeds within the normal range. Generally fat loss mainly consumes our subcutaneous fat, which is mobilized into the bloodstream and transported to our liver for lipolysis, and then involved in energy consumption. As the body’s energy needs become excessive, the fat previously stored in the body is utilized and the fat content is appropriately reduced. However, certain harmful components of the blood (serum creatinine, ketone bodies, uric acid, urea nitrogen, metabolic toxins, etc.) will not be reduced, which is equivalent to the blood will not be completely purified after the fat loss, and some cases such as intense exercise, excessive dieting, etc., will also cause a burden on the body, and the increase of harmful substances. Each person’s physical quality is different, fat loss program and effect is also different, it is recommended that before fat loss is best to go to the hospital to assess their own physical condition, it is best to be under the guidance of professionals.