Because any piece of meat on our body, whether it is muscle or fat, is a part of our body. Body fat is connected with blood vessels, nerves and muscles. As long as you cut off the fat, it will hurt your blood vessels and nerves at the same time, so you not only cut off the fat, but also make you bleed and hurt your nerves. This is unacceptable, it will harm health and even endanger life. Because the human body is not a machine and fat is not a part, you can take it off directly if you want, and any part of the body is an inseparable whole. This is why liposuction is so dangerous. The reason why the body is fat is because the body is undernourished and its energy can't keep up. So the reason why the body makes you fat is to store energy for you to use when the body needs it. So what you have to do is to find a way to eat food with complete, balanced and sufficient nutrition. If your body has enough nutrition and energy, it won't store fat for you.