Why the effects of obesity injections vary from person to person

Since I’ve been on a diet for a long time, I gain weight quickly depending on my condition or what I eat. The problem is that while I gain weight fast, it doesn't come off easily; it feels like it turns into stubborn fat. Even if I diet again, that accumulated fat doesn't just disappear completely and seems to stay, making me look bloated. That’s why I’ve become interested in trying a weight loss injection to avoid swelling. Of course, I plan to exercise consistently just because I get the injections; I intend to keep working out. However, I’ve noticed a lot of people getting these injections lately, and the results seem to vary widely. Even when starting with the same injection and dosage, some people lose weight dramatically, while others seem to hit a plateau with little difference before and after. This has made me wonder if the effectiveness of weight loss injections varies significantly depending on an individual's body type or characteristics. I would appreciate your advice on why the results differ from person to person. Also, please provide information on what I should do after the procedure to maximize the effectiveness of the injections.