The ketone bodies pass into the brain and replace glucose as an energy source.

However, under ketotic conditions, the heart can effectively utilize ketone bodies for energy.

After the diet has been changed to lower blood glucose for 3 days, the brain gets 25% of its energy from ketone bodies.

The concentration of ketone bodies in blood is maintained around 1 mg/dl.

This is followed by ketonuria - excretion of ketone bodies in urine.

The ketone bodies produced in the liver can also cross the blood-brain barrier.

After fasting for 3 days, the brain gets 30% of its energy from ketone bodies.

This state of having a lot of ketone bodies in your blood is called "Ketosis."

It takes 48 hours for the brain to switch from glucose to ketone bodies.

The mitochondrial form is responsible for the biosynthesis of ketone bodies.