Medical weight gain Do some medications or health conditions cause weight gain or make it hard to lose weight? Yep. Do slow(er) metabolisms or underactive thyroids fuck you up? Sure. Hell, there's even a 'fat gene'.  But guess fucking what?! Most of those are 'only' responsible for 10-15lbs difference compared to someone identical without the drugs/health condition. It doesn't account for carrying the weight of another 2-3 adults!  I had an aunt who had hypothyroidism. At one point she was a bit heavier before she was medicated, and even then, she was MAYBE 10 pounds over her 'ideal'. She finally got a diagnosis and medications, and lost the weight AND FUCKING KEPT IT OFF for 25+ years before she died. It's not fucking impossible.  I worked a sedentary job for YEARS and I didn't fucking blimp up. I started taking birth control years ago due to my fucked up hormones, gained a couple pounds, and managed to lose that and more within a few months. I've been on 'weight positive' medications, and never truly 'blimped up'. Did I gain a bit? Yeah, <15lbs that was lost soon after I either A) got 'used' to it, or B) it worked its way out of my system.  A close friend of mine from high school had PCOS and was pretty slim. Even WITH her condition, she managed to lose weight. Was it slower than someone who didn't have it? Yeah. It was slower/took more dedication, but it wasn't impossible, it just required discipline.  A coworker of mine has a baby that just turned 1. I've known her since high school. She was pretty scrawny back then, and gained a fair bit during pregnancy at the recommendation of her doctor. Even at her 'highest' (with a baby that was born large enough to require a C-section - the dad is pretty tall and baby was already wearing size 3-6 months at birth), she wasn't overweight, and tbh looked like she was trying to smuggle a large watermelon. By the time the kiddo turned 3 months old, she'd lost the majority of what she gained.  Can't say that I've seen it all, but hell. I've seen enough, and it's left me with NO fucking sympathy for fats that try to hide behind these diagnosis/conditions to the detriment of people who actually have it.