The ONLY purpose of the parathyroid glands is to regulate the calcium level in our bodies within a very narrow range so that the nervous and muscular systems can function properly. This is all they do. They measure the amount of calcium in the blood every minute of every day... and if the calcium levels go down a little bit, the parathyroid glands recognize it and make parathyroid hormone (PTH) which goes to the bones and takes some calcium out (makes a withdrawal from the calcium vault) and puts it into the blood. When the calcium in the blood is high enough, then the parathyroids shut down and stop making PTH.
I used to be a carb nazi…I preached that crap for two or three years. And it works!! Really, really well! But intermittent fasting works really, really well too and it disproved the whole theory of insulin response with carbs…I eat whatever the fuck I want nowadays and still maintain under 10% body fat. Leanest dude in my gym by far. Just had 2 pizza burritos full of bacon, pepperoni, grilled chicken, mozzarella and spaghetti sauce on fresh cooked tortillas. I’m a god damned genius for inventing that burrito flavor BTW.