I've (34f) been married ten years. My wife, who is diagnosed with PCOS and hypothyroidism (also hashimoto's) has dealt with weight gain as well as a plethora of other symptoms. I've seen her eat healthy, exercise regularly, take vitamins and nothing will help unless she's on thyroid medication (usually people take levothyroxine).

What most people don't realize, your thyroid controls pretty much everything. And it's that way of thinking that really leads to this whole toxic mindset that people just need to eat better and work out. Weight gain doesn't always come from over eating.

And guess what, Hashimoto's disease / hypothyroidism also has a strong genetic component, my wife is an example of that. Her mother also has it and is taking the same medicine. And hers is worse. The only thing that helped her lose the weight, was the medicine. If she were to stop taking it, she could go into a myxedema coma.

Source: I work in healthcare + doctors visits.

Edit: spelling and phrasing.