Coming up on today's show.

I do believe in relying on ketones and free fatty acids as a primary source of fuel.

I think we're well designed to do that.

We've always selectively hunted the fatest sassiest animals.

What we have between our ears has an enormous metabolic demand.

And if you're relying on sugar to fuel that, then you're living on what I call metabolic kindling all the time.

So what's the alternative? Well, you go out and you find a nice big fat log, right? And you put that on the fire,

and suddenly now you're free. True vitamin A retinol is found exclusively in foods of animal origin.

And obviously the richest natural source of vitamin A's liver. Your immune system can't function without

it. In my book Primal Fat Burner, I talked about the three amigos, which of vitamin A's liver. Your immune system can't function without it.

In my book Primal Fat Burner, I talked about the three amigos, which are vitamin A, retinal,

vitamin D3, colicalciferal, and then vitamin K2, MK4, which is the only form of K2 that we evolved

consuming. We all have the same foundational nutritional requirements. There is nobody alive for whom a vegan diet is an optimal way of eating.

Plants have never been a primary source of nourishment for humans.

Nora, what does it mean to be a primal fat burner?

As a human species, we're actually designed to be one of two things. We're designed to be

either primarily a sugar burner or a fat burner. And 99.5%, maybe 99.9% of the general population

is relying on glucose as its primary source of fuel. And we are led to believe

that that is what we have to do. And the fact of the matter is that we're actually extraordinarily

well designed to rely on fat in the form of free fatty acids and something called

ketones as a primary source of fuel.

And in fact, we're unique in all animal species in that humans are the only species on

...