Which of the following is a myth about speeding up alcohol metabolism?

The belief that taking a cold shower can speed up alcohol metabolism is a myth because the body's ability to metabolize alcohol is primarily determined by the liver's enzymatic activity, which cannot be significantly influenced by external factors like temperature. The liver metabolizes alcohol at a relatively constant rate, approximately one standard drink per hour, regardless of other interventions. Cold showers may provide a temporary sensation of alertness but do not enhance the biological process of breaking down alcohol.

On the other hand, drinking water and eating a large meal can help mitigate the effects of alcohol, such as reducing dehydration and slowing the absorption of alcohol into the bloodstream, respectively. Taking a walk may also help in feeling more sober, but it doesn't affect the rate at which the liver processes alcohol. Thus, identifying cold showers as a method to expedite alcohol metabolism highlights a common misconception about the effects of physical and environmental factors on alcohol processing in the body.