Assessment for an operation against obesity Someone who wants to be operated on for overweight is screened by a team. In addition, it is examined per individual whether the benefits of an operation outweigh the disadvantages, because they are associated with each operation. Extensive research, both physical and psychological, is part of this. Risks and complications of an operation against obesity There are risks associated with every operation. In fact, any operation can threaten someone's life because it is never clear what the body does when it is cut and when anesthesia is administered.