Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The short-term effects of alcohol on the human body can take many forms.Alcohol, specifically ethanol, is a central nervous system depressant, with a range of side effects. The amount and circumstances of consumption play a large part in determining the extent of intoxication; for example, consuming alcohol after a heavy meal causes alcohol to absorb more slowly. Hydration also plays a role, especially in determining the extent of hangovers. The concentration of alcohol in blood is usually measured in terms of the blood alcohol content.