Which is the only way a person can be sure to prevent a hangover?

Avoid Alcohol at all

Explanation:

Alcohol, ethanol is mainly responsible for hangover effect. The effects of hangovers are usually felt after 24 hours or a day of excessive drinking. Hangover symptoms begin when the content of alcohol in blood drops to zero suddenly. The higher the fall, the higher is the hangover. Thus, in order to avoid hangover, an individual must not consume alcohol at all.

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