For many doctors, caffeine isn’t just a beverage; it’s a ritual, a lifeline that keeps morning rounds sharp and late-night calls bearable. Yet behind that comforting cup lies a complex physiological dance between caffeine and cortisol, the body’s primary stress hormone. Both stimulate alertness, but when constantly elevated, they can push the nervous system into overdrive, blurring the line between healthy focus and harmful stress.
Research shows that while moderate caffeine can improve concentration and reaction time, excessive intake amplifies cortisol release, increases heart rate, and disrupts sleep, especially when consumed during already high-stress shifts. For clinicians living on back-to-back calls and irregular meals, this cycle can lead to fatigue, mood swings, and even impaired clinical decision-making. Over time, chronic cortisol elevation contributes to hypertension,…
