In this investigation the effect of the caffeine and cacao on the cognitive performance is studied. Cognitive performance is the way the brain controls the actions of an individual, actions such as attention, perception, memory, executive functions, language and motor skills (Kamphuis, 2014). Stimulants in nowadays society can be considered as one of the elements that are most overused. Some of them can be easily accessed to and hence being used more. Most common stimulants with easy access to be caffeine and cacao. Caffeine and dark chocolate are interesting substances due to their high levels of consumption which brings the question of why are they consumed ,what are their effects and in to what extend does this effects take