Consuming coffee on an empty stomach immediately after waking up can cause blood vessel constriction and a sudden increase in blood pressure. This is particularly risky for individuals over 40, those with hypertension, or people who are chronically sleep-deprived. The practice can lead to adverse health effects due to the body’s physiological response to caffeine in a fasted state. Experts suggest delaying coffee consumption until after a meal to mitigate these risks. The sudden blood pressure surge can strain the cardiovascular system. Individuals sensitive to caffeine should be especially cautious. Prioritizing hydration and nourishment before caffeine intake is recommended for optimal health.