Hey, I'm back. Today we're going to talk about intermittent fasting, lower carbohydrates

and your thyroid. Many times I'll hear from someone that it's dangerous for your thyroid

to do low carbohydrates or fasting. That's what destroys the thyroid. Okay. That is absolutely

not true. Let me first kind of give you the basics. You have this thing called the bituitary.

It's a small gland in your brain from the size of a pea and it sends a message down to

the thyroid. It controls the thyroid. Thyroid is at the base of the neck right here. It's

about two and a half inches wide. It comes from the Latin word which means shield because

it looks like a shield. So this gland that's triggering the main thyroid hormone is being

controlled by the bituitary through something called the thyroid stimulating hormone. Pretty

much describes what it is, right? So then the thyroid releases its main hormone called

T4. The four represents the number of iodine molecules. So T4 is an inactive thyroid hormone.

It has to be activated to make it work. And 80% of the activation happens to the liver

and 20% happens through your kidney. So what happens when it gets activated through

certain enzymes? It strips off an iodine and it becomes T3. Okay. So T3 is the active form

of the thyroid hormone. So T3 does its job and it has everything to do with metabolism

and speeding things up and making things work through pretty much all the cells. So when

it does its job, it sends a signal back up to the bituitary, complying with this order,

completing the action and then this can turn off. So we have this whole feedback system.

That's dependent on a lot of different things, the environment, food, etc. Now it is true

that there are certain things that will influence these hormones like a low carbohydrate diet

and fasting can cause a low normal T3. Okay. That's the active form. It's not necessarily

abnormal, but it could be low normal. Okay. Still within the range. Okay. Why would it be

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