Alcohol is created when grains, fruits, or vegetables are fermented, a process that uses yeast or bacteria to change the sugars in the food into alcohol. Alcohol has different forms and can be used as a cleaner or antiseptic; however the kind of alcohol that people drink is ethanol, which is a sedative. When alcohol is consumed, it's absorbed into a person's bloodstream. From there, it affects the central nervous system (the brain and spinal cord), which controls virtually all body functions. Alcohol actually blocks some of the messages trying to get to the brain. This alters a person's perceptions, emotions, movement, vision, and hearing.