Degreasing oil and losing weight is to prevent the digestion and absorption of fat through drugs, so as to reduce calorie intake and achieve the purpose of losing weight.

At present, the main drug used is orlistat, whose principle is to inhibit lipase in gastrointestinal tract, thus inhibiting fat digestion. Because it is not absorbed by the intestine, there are few systemic side effects; It is precisely because of this that this drug does not have long-term efficacy and needs to be taken after each intake of oil.