Caffeine, the main active ingredient in coffee, stimulates the central nervous system.

This helps your brain transition from a sleepy state to full alertness. It can sharpen focus, improve reaction time, and even enhance short-term memory — making it a popular choice for starting the day. For seniors, a moderate cup can gently fight morning fatigue without overwhelming the system. Coffee may also lift your mood, as caffeine can boost dopamine levels, the brain’s “feel-good” chemical, potentially lowering the risk of depression when consumed in moderation.