In clinical trials, most participants taking Wegovy or Mounjaro to treat obesity lost an average of 15% to 22% of their body weight — up to 50 pounds or more in many cases. But roughly 10% to 15% of patients in those trials were "nonresponders" who lost less than 5% of their body weight. Now that millions of people have used the drugs, several obesity experts told The Associated Press that perhaps 20% of patients — as many as 1 in 5 — may not respond well to the medications. It's a little-known consequence of the obesity drug boom, according to doctors who caution eager patients not to expect one-size-fits-all results.
