Hypoglycemia

Bank account running out of cash mid-emergency

Your blood is like a bank account that must always hold $70–100 in cash to keep the brain and heart alive. The pancreas is the teller who deposits (insulin) or withdraws (glucagon) based on whether you just ate or are fasting. The liver is the vault that stores cash as glycogen (savings) and can print new emergency cash from your paycheck (protein) when the vault runs low. The adrenal glands are the security alarm that goes off when the account drops below $70, flooding your body with adrenaline to force the vault to release cash fast. When you take insulin or a sulfonylurea medicine, it's like the teller making huge withdrawals even after the account is nearly empty—the alarm screams (adrenaline causes sweating and shaking), but the teller cannot be stopped, so the account crashes to critical levels. If the vault is broken (liver disease), the printer is broken (adrenal insufficiency), or the security system fails (pituitary failure), the account empties completely and the brain shuts down. When you drink glucose or get IV dextrose, you are making an emergency deposit that immediately stops the alarm and lets the brain work again.