Many people who stop using weight loss drugs will return to their previous weight within two years, a new review of existing research has found. CNN adds: This rate of weight regain is significantly faster than that seen in those who have lost weight by changing other lifestyle factors, such as diet and exercise, rather than relying on GLP-1 medications, researchers from the University of Oxford report in a paper published Wednesday in The BMJ journal. GLP-1, which stands for glucagon-like peptide-1, is a hormone naturally made by the body that helps signal to the brain and the gut that it's full and doesn't need to eat any more. Weight loss drugs mimic the action of this hormone by increasing the secretion of insulin to lower blood sugar. They also slow the movement of food through the digestive tract, which helps people feel full more quickly and for longer, and they work in the brain to reduce appetite.Read more of this story at Slashdot.