About Last Night

What really happens to your body when you drink too much--and why most hangover remedies won't work.

Which leads to another theory that puts the blame for the hangover on pure physiology. Alcohol is first broken down in the liver into a toxic substance called acetaldehyde. Acetaldehyde is then further broken down into a harmless substance called acetate. At high doses, acetaldehyde causes nausea, vomiting, sweating and other symptoms akin to the hangover. Although there is no acetaldehyde in your system when you have a zero blood-alcohol level, some of the after-effects of the toxin may persist the morning after.

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