In 2019, UMC Utrecht changed the working method. Adults were also allowed to drink from that moment until surgery. In the following years, the hospital collected data from about 16,000 patients. It turns out, as the doctors already thought, just as safe, since fluids are quickly removed from the stomach. And patients feel better after surgery, says Marsman. She compares a procedure to running a marathon. If you take in a lot of carbohydrates beforehand, you will be less exhausted.