Today, caffeine is a widespread food that can be found in various forms, from coffee, tea and cocoa as natural sources to all modern non-alcoholic energy drinks and supplements. The literature shows different results when the question arises whether caffeine speeds up reaction time in individuals, so some studies claim that it has a significant effect, while the results of other studies have shown the opposite, that caffeine has little or no effect on reaction speed. The aim of this research was to determine the effect of caffeine in the amount present in one espresso coffee on the speed of the sensorimotor reaction to a visual stimulus. 76 students participated in the research and were tested in three situations: without coffee consumption, after consumption of caffeinated coffee and decaffeinated coffee. Reaction speed was measured using the online version of the Simple Reaction Time Test without and after coffee consumption. The results showed that there was a slight acceleration of the reaction after the consumption of coffee (60 mg of caffeine), but also when consuming decaffeinated coffee (5 mg of caffeine), which enhances the placebo effect. Although the consumption of coffee did not significantly affect the speed of reactions, the subjects perceived themselves positively in the context of energy and mood.