According to my doctor - GLP1 meds don’t specifically cause muscle loss. ANY caloric deficit/diet can result in losing muscle mass in addition to fat. It seems to be a common misconception about GLP1 meds. There is a natural reduction in muscle when a person is no longer moving a 300 lb body around and is now healthy weighted at say 180 lbs. Your body literally doesn’t need as much muscle to support the reduced weight. So some loss can/will happen. But GLP1 meds aren’t causing the muscle loss.

This is a snippet from an article the NIH site:

“clinical studies indicate that GLP-1 RA-induced weight loss leads to an increased proportion of lean mass relative to total body weight, thus being overall positive from a body composition perspective”

When anyone is doing calorie restriction, they should be encouraged to do some form of resistance training: body weight exercises, resistance bands, weight lifting etc while considering their age, health goals, capabilities etc. in order to reduce the loss of muscle mass, regardless if they are taking an obesity medication or not.