What is glucose primarily known as in relation to the brain?

• A. A supplemental nutrient
• B. The body's main source of energy
• C. A form of waste produced by the brain
• D. An alternative source of cognitive processing

Answer: (B)

Glucose is known as the body's main source of energy, particularly for the brain. The brain is highly metabolic and consumes a significant amount of glucose, despite representing only about 2% of body weight. This energy source is crucial as the brain operates mainly on glucose, relying on it for the majority of its functions, including cognitive processing, memory, and neurotransmission. Other sources of energy, such as fats or proteins, are not efficiently utilized by the brain under normal conditions, making glucose essential for optimal brain function. This underscores the importance of glucose in maintaining cognitive health and supports the emphasis on a balanced diet that provides sufficient carbohydrates for sustaining brain activity.