Caffeine has a similar chemical structure to dopamine, which is a neurotransmitter that regulates motor functions in the human body; as a result, caffeine boosts the corresponding processes related to the action of dopamine. In other words, caffeine stimulates physical activity, and because it is also very closely related to the metabolism of serotonin, it also influences our mental well-being, focus, attitude, and general ability to concentrate.

It is important to note however that in some cases, caffeine may cause some less desirable effects such as anxiety, shaking, headaches, sweats, or heart arrhythmia.

Moreover, brewed coffee is always slightly acidic. This acidity may lead to unwanted physical effects in some consumers, such as induced upset stomach, heartburn, or a bad after taste.