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Given the sub, ADHD meds are the more likely reason - though coffee will definitely do it to a lesser extent.
Makes sense. I take 30 mg methylphenidate depots which I find quite mild in regards to appetite repression. Though I guess some may be on more severe medications or/and at higher doeses.
Back when I was on 5mg Ritalin (this was a long time ago now) I lost probably a third of my body weight, and could frequently live for days off a pack of chips or similar. Meds and mileage varies though.