Drinking alcohol is a popular social activity around the world. Basically, alcoholic beverages are produced from the fermentation of carbohydrate or sugar. To name a few, beer is fermented from barley; sake from rice; wine from grapes; mead is made by fermenting honey with water. Through the fermentation process, with the help of yeast or bacteria, sugars in food will be converted to ethanol, the alcohol in the alcoholic drinks.

While having a drink can be enjoyable, when you get carried away and drink in excess, it can result in a hangover. A hangover is a group of unpleasant signs and symptoms that can develop after excessive alcohol consumption. How does hangover come about? Here is a closer look.