The effects of caffeine on the human body include an increase in performance, mood elevation, mental and cognitive improvement, headaches and an inability to sleep, according to information housed on the University of Delaware website. Too much caffeine is very harmful to a human being both mentally and physiologically because it is an addictive and nutrition-free substance. Caffeine is found in coffee, tea, cola and other products.
Caffeine also raises blood pressure, increases the risk of heart attack, causes incontinence and reduces fertility in women, notes Caffeine Informer. Consuming caffeine during pregnancy increases the risk of miscarriages because caffeine crosses the human placenta and caffeine levels in the fetus can reach as high as the mother's levels. Caffeine works by increasing spinal motor neurons, which in return causes a person to be more alert and focused.
Caffeine is consumed by more than 90 percent of the world's population, reports Healthline, despite the fact it provides no nutritional value. Because caffeine is very addictive, studies show that it can act as a gateway to other addictive substances, such as alcohol and nicotine. Caffeine affects many parts of the body, including the central nervous system, digestive and excretory systems, circulatory and respiratory systems, and skeletal and muscular systems.