Best way I know to lose weight is to lower carbs & this doesn’t mean starving yourself at all. Insulin is a fat storing hormone. More carbs=more insulin=weight gain. Yep, it’s that simple.
A note about thryoid tests. Most docs just test TSH & this isn’t what’s needed. To evaluate thyroid function, a free T3 & free T4 test are what’s needed. I walked around hypothyroid for years because all that was done was TSH.