The primary fuel source for the brain is glucose, a type of sugar. Glucose is derived from the breakdown of carbohydrates in the diet. When we consume carbohydrates, they are broken down into glucose, which is then transported to the brain and other tissues via the bloodstream.
The brain relies heavily on glucose as its main source of energy. It requires a constant supply of glucose to function optimally. The brain's high energy demands are due to its complex activities, such as maintaining neurotransmitter balance, conducting nerve impulses, and supporting cognitive processes.
In addition to glucose, the brain can also utilize ketones as an alternative fuel source during periods of fasting, prolonged exercise, or a low-carbohydrate or ketogenic diet. Ketones are produced by the liver from fatty acids when glucose availability is limited. However, glucose remains the brain's preferred fuel under normal conditions.
It's worth noting that while the brain primarily uses glucose for energy, it is also capable of utilizing other energy sources, such as lactate and certain amino acids, in specific circumstances. However, these alternative fuel sources play a relatively minor role compared to glucose.
