Exercise is a very small part of losing weight.
Weight loss is about what you eat.
If you have an addictive relationship with food, this can be very hard to control.
Mounjaro and co, are not a magic bullet, if they are working for your friend it’s because she’s eating less. The people who do best on them make significant lifestyle changes, mainly diet but also eventually exercise which is of course good for your general health.
If you are going to express opinions on weight loss methods, might you consider understanding the very basics?