Apologies, there are so many newbies who do not do any research before starting tirz, or whatever GLP-1, and don't realize all the good habits they think they have, sometimes they do and sometimes they don't actually have them. You can easily find out how tirz works by googling it. There are tons of articles that explain how it works, and on what receptors. And it's a good rule of thumb for anyone on these meds to do that homework, so they understand what they are taking. Obviously you are a tried and tested healthy eater, as was I. You are only at 2.5 mg a week - that is the introductory/starter dose. Many are lucky and lose on it. Many do not. Many only start to lose once they hit 7.5mg or 10mg or 12.5 or 15. What has swept through places like Reddit is this notion that you have to stay on a low dose. That somehow being on a low dose is good or better, and really it's a meaningless concept. You do want to maximize each dose for yourself before increasing. I am no doctor, I can give no medical advice, can only speak to what I've learned and/or experienced for myself. How long have you been on the 2.5mg dose? If a few months, then it is time to move up, and if you only just started it, and are in your 3d week, then I'd suggest waiting another week, but in both cases, I suggest you increase your protein, increase your water, don't worry about the other macros - I don't think ketosis or IMF or anything like those diets are helpful on this med, my personal opinion - and see how you do deliberately increasing those for the next week. Give yourself some time for your body to catch up with how the med works - your hormonal imbalances, your PCOS makes it work more slowly, it's just a fact - and time for your body to adjust to the new and improved plan, yes, it's only a tweaking of the course you've followed for years, but the difference between 100 grams of protein and 130 or more per day is actually quite amazing. Same too with the hydration. In either case, whether you've been on 2.5mg for only 3 weeks, or for more than a month, do the new and improved for another week, and if there is no change in terms of weight loss, then increase your dose. And if you're on compound, then you don't have to increase up to 5mg per the standardized, you can increase in smaller increments. You've been lucky, on 2.5mg with no side effects, and great appetite suppression, no food noise, etc. - it would be wonderful if you can keep those effects, and not experience the gastro and other side effects, so titrating up slowly is always a good idea.