There are, however, certain populations in which reducing carbohydrate intake to very low levels may not be appropriate: patients with ... thyroid defects, ....There are a couple of rationales for why this hypothesis persists, and i wish to gawd somebody would run a proper RCT to straighten it out -- because i'm absolutely, positively sure that the position is BULLSHIT.
I'm not the only one, either. One of those who agree, Sam the "worldly monk," wrote an outstanding article about this misconception -- i can hardly add anything to make the point better! It's just that compared to a lot of theorizers, i'm the one in the trenches with considerable experience. Notably, the only significant argument Sam got was NOT from a hypothyroid....
The more starch/sugar one consumes, the more thyroid hormone is needed by the body to clear the ensuing glucose spike from the blood. We see the same situation with vitamin C -- the more BG, the more C is needed. Apparently, lab-test-junkies of the gym-rat persuasion have extrapolated LOW T3 FROM A LOW-CARB DIET!!! without actually experiencing any hypothyroid symptoms ... the absence of which defines a diagnosis of EUthyroidism.
Wooo also CLEARLY elucidated the situation of hypothyroid symptoms being seen in euthyroid individuals who are losing fat weight; it's all about the body getting enough fuel so that it knows it can afford to "waste" energy for optional purposes! One apparently just does not see people damaging their thyroids irrevocably on a low-carb diet, and becoming clinically hypothyroid! But you DO see people doing that who insist on eating things like wheat and legumes and sugar and industrial seed-oils -- THAT is where the modern glut of thyroid patients are coming from (opinion: don't ask me for references).
So if you're hypothyroid and want to try LC-paleo to see if you can improve your health and sense of well-being, DON'T AUTOMATICALLY BELIEVE that because someone as savvy as Adele wrote it, it has to be true. The paper quoted above makes the point ITSELF, that the historical record of health and dietary recommendations are full of mistakes. You'll only KNOW if LC gives you a better quality of life if you dive in and try it yourself -- and NOT like that Oz yoyo did for ONE DAY!!!