Ever since the pharmaceutical company Novo Nordisk realized that GLP-1 drugs were useful for more than diabetes, doctors and researchers have struggled to answer a deceptively simple question: Who should be taking them?

A new study shows that people Zepbound lost about 50% more weight than those using Wegovy. It was the first head-to-head trial of the blockbuster weight-loss medications.

One weight loss injection has been branded more effective than another, after scientists carry out the first ever head-to-head trial of Mounjaro and Wegovy.