So a lot of times I'll get feedback from people that have this idea that your body, especially your

brain can only run on glucose, right? That's the primary fuel that is absolutely not true. You

can run your body on ketones and other types of fuel. So ketones generally will provide about 40

to 70% of the fuel in the body. So then the question is what other fuel is going to make up the

difference because if ketones are only providing 40%, what else are we going to run our body on?

Well, there's always going to be a small amount of glucose but your body can run on something

called fatty acids. So the fat will turn into ketones and fatty acids, okay? So you can still

use that a small amount of something called lactate but also glucose. So with the brain it's a little

bit different because you could run 70% of the brain on ketones and the rest is going to be either

lactate or glucose, okay? So the question is where are you going to get the glucose if you don't

want to do carbohydrates? Well, your body can make glucose and that process is called glucose

neogenesis, the making of new glucose. Where does it get it from? Fat and protein. So certain

amino acids can turn into glucose and also certain fractions of fat can turn into glycerol

which will then convert into glucose. So that's really where you're getting your glucose from.

So the body might need 36 grams of glucose per day. It can easily get it from fat or amino acids.

You don't need carbohydrates to supply this glucose. So in summary, when you lower your carbohydrates,

you want to run your body on mostly ketones and fatty acids, some lactate and some glucose,

but originating from fat and amino acids in that carbohydrates.