Just a snippet from "you and your hormones" from the Society for Endocrinology.
(if, like me, you've been told weight gain is nothing to do with it!)
"Hypothyroidism in adults causes a decreased metabolic rate. This results in symptoms which include fatigue, intolerance of cold temperatures, low heart rate, weight gain, reduced appetite, poor memory, depression, stiffness of the muscles and infertility."
The action of sunlight on our skin produces a substance called cholecalciferol, which is converted by the liver to calcidiol.
So, vitamin D is produced in the kidneys, but under its other name of cholecalciferol it is produced in the skin. And under yet another name, calcidiol, it is produced in the liver.
And the only thing we all already know about vitamin D is that it needs sunlight - so how does that get into the liver and kidneys?
But they are all vitamin D because they have just said so...
The active form of vitamin D is produced primarily by the kidneys
Ah - so all these differently named things which are vitamin D also are not vitamin D because they are not active???
Yes - it does make some sense if you already understand. For anyone else, it is grotesquely confusing.
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hypothyroidism weight gain 
Hypothyroid + Vitamin D/ amount to Take when Deficient 
Hypothyroidism and hormone resistance Need help with how to loose weight. 
Hypothyroidism and vitamin d deficiency 
