Which item is used to supply some of the fuel needed by the brain only after the body has been fasting for a while?

Question

Quizplus · Accepted Answer

After the body has been fasting for a while, it goes into a state of ketosis where it starts breaking down stored fats to produce ketones. Ketones are then used by the body, including the brain, as an alternative source of fuel in absence of glucose. The brain can use ketones for energy during periods of fasting, low-carbohydrate diets, and prolonged exercise.

Which Item Is Used to Supply Some of the Fuel