Question: if not partially caused by diet, does that mean weight gained by people with a thyroid problem is all water weight? Because otherwise you'd still need 9 kcal/g of fat gained?
I tried googling, but the results aren't very useful with regard to the exact mechanism how thyroid problems cause weight gain.
Edit: From more reading I now believe that it's still a diet problem, but the thyroid issues seem to make it harder to eat less.