Why can hypoglycemia cause brain damage in infants and children?

• A. They have limited glucose stores
• B. They have high fat stores
• C. They have high insulin resistance
• D. They have enhanced glucose production

Answer: (A)

Brain cells need a steady supply of glucose to make ATP and keep their membranes and signaling systems working. In infants and young children, glucose stores are small and the mechanisms to maintain glucose during fasting are immature, so a drop in blood glucose occurs quickly. When the brain runs out of glucose, ATP production falls, ion pumps fail, and neurons cannot maintain proper electrical activity or neurotransmission. This energy crisis triggers harmful cascades—excitotoxicity, calcium overload, and metabolic stress—that can lead to lasting brain injury, especially in a developing brain. Other ideas don’t explain the problem: having high fat stores doesn’t protect the brain from low glucose, insulin resistance isn’t a typical driver in young patients, and increased glucose production would help prevent hypoglycemia rather than cause damage.