I would agree.
I have an underachieve thyroid.
I usually eat one meal a day (occasionally am so hungry that I'll have a couple of poached eggs - maybe once a fortnight or so). I don't drink very much and rarely eat fast food, but I am borderline obese.
My one meal isn't a 6,000 calorie curry or anything like that -it's a"normal" dinner. I don't count calories, but yesterday for instance, I had a couple of small potatoes, peas, a yorkshire pudding, carrot and two sausages (thick ones). I had a matchbox sized piece of cheese and a couple of Ritz crackers to finish.
Tonight I'm having pasta with homemade sauce (tin of tomatoes, 1 onion, garlic and chilli). I've got raspberries for pudding and am really looking forward to them 😁
Eating like this, being constantly hungry, has kept my weight pretty steady at 11 and half stones (I am a shortarse - I am as fat as butter to look at). If I are more I would get VERY fat, VERY quickly.
Many people can't restrict their diet because of medication etc.