Final answer:
No, drinking black coffee will not easily sober you up as only the liver metabolizing alcohol over time leads to sobriety, despite the stimulating effects of caffeine on the central nervous system.
Step-by-step explanation:
The answer to whether drinking black coffee can easily sober you up is No. Coffee indeed contains caffeine, which is a stimulant and can make you feel more alert. The caffeine in coffee stimulates the central nervous system, which is why many people drink it in the morning to help them wake up.
However, when it comes to alcohol metabolism, the liver needs time to metabolize the ingested alcohol. No matter the caffeine intake, sobriety cannot be rushed. It takes about five hours for someone legally intoxicated with a BAC of 0.08 to sober up, regardless of drinking coffee or taking a shower.