Final answer:
People under 21 should avoid drinking because alcohol can have negative effects on their health and well-being.
Step-by-step explanation:
People under 21 should avoid drinking because alcohol can have negative effects on their health and well-being. Ingesting alcohol at a young age can impair coordination, vision, and judgement, and it can also lead to aggressive behavior. Excessive alcohol consumption can result in serious consequences such as road accidents, loss of jobs, family disruption, memory loss, and various physiological disorders. Moreover, it increases the risk of certain forms of cancer. It is important for young individuals to prioritize their health and safety by abstaining from alcohol until they are of legal drinking age.