To effectively sober up after drinking, what option is NOT effective?

The option that is not effective for sobering up is drinking coffee. While coffee is often believed to provide a quick fix for reducing the effects of alcohol, it does not actually speed up the metabolism of alcohol in the body. The liver is responsible for breaking down alcohol, and this process takes time, regardless of other substances consumed.

Drinking coffee may make a person feel more alert due to its caffeine content, but it does not change their blood alcohol concentration. As a result, individuals may mistakenly believe that they are sober enough to drive or perform other tasks, when in fact they are still impaired. Therefore, relying on coffee as a means to sober up can be dangerous, as it can lead to overestimating one's level of sobriety.

In contrast, waiting for time is the only effective method to sober up, as it allows the body to process and eliminate alcohol. Drinking water and eating food can help mitigate some of the effects of alcohol, such as dehydration or low blood sugar, but they do not directly speed up the sobering process.