Caffeine is an active ingredient that stimulates and stimulates the human nervous system. It occurs naturally in coffee and tea and is released in the body when combined with stomach acid. Through the bloodstream, the caffeine reaches the central nervous system on the shortest path, where it develops its stimulating or exciting effect. Ingested in low dose, your concentration and attention increases. Fatigue symptoms decrease considerably. At higher doses, the motor brain centers are also affected. You are then in a state of increasing excitement and nervousness. Take caffeine over a longer time, the stimulating effect decreases. The nerve cells work slower and your body needs a further increase in the intake. You can find out a dependency yourself if you stop consuming. A short time later, symptoms such as headache, fatigue and loss of concentration occur. They feel sleepy, irritable and powerless. The crowd makes the difference. You can enjoy your cup of coffee or tea in the morning in the usual way.