The present invention belongs to the field of
medicine technology, and specifically relates to the use of poly (L-
lactide) and / or a
copolymer comprising L-
lactic acid repeating units or microspheres thereof, or a composition comprising poly (L-
lactide) and / or a
copolymer comprising L-
lactic acid repeating units or microspheres thereof in the preparation of a
drug for preventing and treating
obesity and metabolic complications caused by
obesity. In an embodiment, the composition further comprises at least one GPR81
agonist. The poly (L-
lactide) and / or the
copolymer comprising L-
lactic acid repeating units, the microspheres thereof, or the composition comprising the same provided by the present invention are capable of preventing the fat and / or
body weight of a subject from increasing while maintaining
muscle mass, have good effects of reducing weight, increasing
muscle mass and regulating
glycolipid metabolism, and have no side effects. It can be administered once every few months, which improves
patient compliance and provides a new strategy for the treatment of
obesity and complications caused by obesity.