The only certain way to prevent hangover symptoms is to not drink any alcohol are all, but if you do plan to drink there are steps that you can take to reduce your chances of getting a hangover.
Most of the unpleasant symptoms experienced during a hangover are caused by alcohol's diuretic effects, causing the body to become dehydrated, and the toxins that are produced as the liver metabolizes alcohol. With a little planning, the effect of these processes can be greatly reduced.
Preventing a HangoverThe best cure for a hangover is to not get one in the first place. Here are some tips for preventing a hangover.
Drink Moderately - It bears repeating, if you do not drink to the point of intoxication, your chances of getting a hangover is nil. Although there are exceptions, only people who drink to excess will experience hangover symptoms.
Water - Because dehydration is one of the main causes of hangover symptoms, drinking water along with alcohol beverages can prevent those symptoms. Drinking a glass of water before you start drinking alcohol, alternated with alcoholic beverages during the evening and before going to bed will go a long way toward relieving hangover discomfort.
Eating Fried or Fatty Foods - Eating any food prior to a bout of drinking will slow the absorption of alcohol into the body. Eating fatty or greasy foods will help coat the lining of the stomach and slow absorption. In some cultures, people will take a spoonful of olive oil prior to drinking to slow down the absorption process.
Avoid Congeners - The chances of getting a hangover can be reduced by drinking alcoholic beverages that contain fewer congeners, or other chemical compounds that contribute to the taste, smell and appearance of the beverage. Pure alcohol drinks, such as vodka or gin, contain few congeners, while drinks such as whiskey, brandy and red wine contain more.
Over-the-Counter Remedies - There are many over-the-counter products that are marketed as hangover "cures." The ones that contain carbon that works as a toxin filter in the body, may have some affect on reducing hangover symptoms, if they are taken prior to drinking. Because most of these remedies are supposed to be taken several times over the course of the evening, each time with a full glass of water, it may be the water that has the actual preventive qualities.
The Bottom LineIf you drink any alcohol at all you can experience some negative effects the next morning. Generally, the more you drink the greater the chances of experiencing severe hangover symptoms.
If you drink moderate amounts or alternate during the evening between water and alcoholic beverages, you can reduce alcohol's dehydration and toxic effects and reduce many of the unpleasant symptoms of a hangover.
See Also: What Is a Hangover?
National Institute on Alcohol Abuse and Alcoholism. "Alcohol Hangover - Mechanisms and Mediators (PDF)." 14 Jan. 2002.
A.D.A.M. "Hangover Treatment." 10 Oct. 2007