The Brain Prefers to Use ____ as Fuel, but Under

Question

The brain prefers to use ____ as fuel, but under prolonged fasting or starvation it adapts to use ____.
A) fatty acids; glucose
B) glucose; β-hydroxybutyrate
C) glycogen; fatty acids
D) glucose; fatty acids
E) β-hydroxybutyrate; amino acids

Accepted Answer

The brain primarily uses glucose as a source of energy under normal conditions. However, during prolonged fasting or starvation, it adapts to use ketone bodies, such as β-hydroxybutyrate, as an alternative energy source when glucose availability decreases.