Hi there @hawkssr . I hope you find a solution to your weight loss. I'm sure that must be frustrating to eat every hour and still lose weight. I don't know what to suggest in terms of diet (I'm trying to figure that one out myself - I'm also underweight), but you may want to get tested for Hashimoto's. I assume you've probably already had your thyroid hormones tested and gotten normal results, but if you haven't already, you might want to get your TPO and TG antibodies tested, since those could explain hyperthyroid symptoms like weight loss even if things like TSH, T3, and T4 are all normal.