Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Alcohol shuts down the brain in top-to-bottom order: first judgment and coordination fail, then memory blacks out, then consciousness fades, and finally the brainstem stops telling the lungs to breathe.
Brain's dimmer switch turned all the way down
Imagine your brain is a concert venue with thousands of light switches. GABA receptors are like switches that turn lights OFF (brakes), and glutamate receptors are like switches that turn lights ON (accelerators). Alcohol sneaks in and superglues all the OFF switches into the pressed-down position while simultaneously unplugging all the ON switches from the wall. The stage lights (frontal cortex judgment) die first because they're the most sensitive to the dimming. The backup lights in the orchestra pit (cerebellum coordination) flicker next. The emergency exit lights (hippocampus memory) go dark after that. Finally, the absolute last lights to die are the ones powering the life-support systems (medulla breathing control) in the basement—but when those go out, the whole building stops functioning.
ACEP Clinical Policy on Acute Alcohol Intoxication · NIAAA (National Institute on Alcohol Abuse and Alcoholism) · ASAM Public Policy Statement on Alcohol Use Disorder · AMA guidelines on screening and brief intervention for unhealthy alcohol use · reviewed 2026-07-07