I've had thyroid disease for 36 years. Initially graves and then due to treatment, hypo. I took 100mcg of levothyroxine for the first 26 years and this was increased to 112.5 ten years ago.
I maintained 9st 7lb until my secind child when it crept up to 10st 7lb, in my 40s 11st 7lb, 50s 12st 7lb. Partly due to middle age, but mostly due to overindulgence arising from a love of good food and wine.
It comes off with persistence and fewer calories in. The wine really makes a difference. In my 20s/30s Incoukd get 10lb off in 2 to 3 weeks. Now it's 4lb and I have to be strict to maintain 11stone.
A typical day is: yoghurt, bran, a few nits and berries; salad with protein and an apple and satauma; grilled fish/chicken/bean stew/turkey bol with minimal potato, rice, pasta, fruit for pudding. No alcohol.
I believe weight management is 70% of what goes in and 30% of energy out. When I had small children I found I didn't need to formally exercise because Insoent my time picking them uo, picking their stuff up and walking to the park/running around after them.
Carbs, fat, sugar, etc., loads it on.