You're right. You can lose weight by wrapping a part with plastic wrap. The principle of plastic wrap to lose weight is just like the principle of a space capsule in a weight loss instrument. The capsule is heated to sweat. Plastic wrap is wrapped in exercise and sweating, and the principle is the same.

If you put some slimming cream or something on the parts to be reduced before wrapping the plastic wrap, the weight loss effect will be better.