alcoholic beverages effects

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A row of alcoholic beverages – in this case, spirits – in a bar.

An alcoholic beverage is a drink containing ethanol (commonly called alcohol). Alcoholic beverages are divided into three general classes: beers, wines, and spirits. They are legally consumed in most countries, and over 100 countries have laws regulating their production, sale, and consumption.[1] In particular, such laws specify the minimum age at which a person may legally buy or drink them. This minimum age varies between 16 and 25 years, depending upon the country and the type of drink. Most nations set it at 18 years of age.[1]

The production and consumption of alcohol occurs in most cultures of the world, from hunter-gatherer peoples to nation-states.[2][3] Alcoholic beverages are often an important part of social events in these cultures. In many cultures, drinking plays a significant role in social interaction — mainly because of alcohol’s neurological effects.

Alcohol is a psychoactive drug that has a depressant effect. A high blood alcohol content is usually considered to be legal drunkenness because it reduces attention and slows reaction speed. Alcohol can be addictive, and the state of addiction to alcohol is known as alcoholism.
Types
Main article: List of alcoholic beverages

Alcoholic beverages that have a lower alcohol content (beer and wine) are produced by fermentation of sugar- or starch-containing plant material. Beverages of higher alcohol content (spirits) are produced by fermentation followed by distillation.
[edit] Beer
Main articles: Beer, Brewery, Brewing, and Mashing

Beer is the world's oldest[2] and most widely consumed[3] alcoholic beverage and the third most popular drink overall after water and tea.[4] It is produced by the brewing and fermentation of starches which are mainly derived from cereal grains — most commonly malted barley although wheat, maize (corn), and rice are also used. Alcoholic beverages which are distilled after fermentation, fermented from non-cereal sources such as grapes or honey, or fermented from un-malted cereal grain, are not classified as beer.

The two main types of beer are lager and ale. Ale is further classified into varieties such as pale ale, stout, and brown ale.

Most beer is flavored with hops, which add bitterness and act as a natural preservative. Other flavorings, such as fruits or herbs, may also be used. The alcoholic strength of beer is usually 4% to 6% alcohol by volume (ABV), but it may be less than 1% or more than 20%.

Beer is part of the drinking culture of various nations and has acquired social traditions such as beer festivals, pub culture, pub games, and pub crawling.

The basics of brewing beer are shared across national and cultural boundaries. The beer-brewing industry is global in scope, consisting of several dominant multinational companies and thousands of smaller producers, which range from regional breweries to microbreweries .
[edit] Wine
Main articles: Aging of wine, Grape, Must, Oenology, Wine, and Winemaking

Wine is produced from grapes, and fruit wine is produced from fruits such as plums, cherries, or apples. Wine involves a longer (complete) fermentation process and a long aging process (months or years) that results in an alcohol content of 9%–16% ABV. Sparkling wine can be made by adding a small amount of sugar before bottling, which causes a secondary fermentation to occur in the bottle.
[edit] Spirits
Main articles: Distillation, Distilled beverage, Ethanol, and Liqueur

Unsweetened, distilled, alcoholic beverages that have an alcohol content of at least 20% ABV are called spirits.[5] Spirits are produced by the distillation of a fermented base product. Distilling concentrates the alcohol and eliminates some of the congeners.

Spirits can be added to wines to create fortified wines, such as port and sherry.
[edit] Alcohol content of beverages
Main article: Alcohol by volume

The concentration of alcohol in a beverage is usually stated as the percentage of alcohol by volume (ABV) or—in the United States—as proof. In the U.S., proof is twice the percentage of alcohol by volume at 60 degrees Fahrenheit (e.g., 80 proof = 40% ABV). Degrees proof were formerly used in the United Kingdom, where 100 degrees proof was equivalent to 57.1% ABV. Historically, this was the most dilute spirit that would sustain the combustion of gunpowder.

Ordinary distillation cannot produce alcohol of more than 95.6% ABV (191.2 proof) because at that point alcohol is an azeotrope with water. A spirit which contains a very high level of alcohol and does not contain any added flavoring is commonly called a neutral spirit. Generally, any distilled alcoholic beverage of 170 proof or higher is considered to be a neutral spirit.[6]

Most yeasts cannot reproduce when the concentration of alcohol is higher than about 18%, so that is the practical limit for the strength of fermented beverages such as wine, beer, and sake. Strains of yeast have been developed that can reproduce in solutions of up to 25% ABV.
[edit] Standard drinks
Main article: Standard drink

A standard drink is a notional drink that contains a specified amount of pure alcohol. The standard drink is used in many countries to quantify alcohol intake. It is usually expressed as a measure of beer, wine, or spirits. One standard drink always contains the same amount of alcohol regardless of serving size or the type of alcoholic beverage.

The standard drink varies significantly from country to country. For example, it is 7.62 ml (6 grams) of alcohol in Austria, but in Japan it is 25 ml (19.75 grams).

In the United Kingdom, there is a system of units of alcohol which serves as a guideline for alcohol consumption. A single unit of alcohol is defined as 10 ml. The number of units present in a typical drink is printed on bottles. The system is intended as an aid to people who are regulating the amount of alcohol they drink; it is not used to determine serving sizes.

In the United States, the standard drink contains 0.6 US fluid ounces (18 ml) of alcohol. This is approximately the amount of alcohol in a 12-US-fluid-ounce (350 ml) glass of beer, a 5-US-fluid-ounce (150 ml) glass of wine, or a 1.5-US-fluid-ounce (44 ml) glass of a 40% ABV (80 proof) spirit.
[edit] Serving sizes
Main article: Alcoholic spirits measures

In the United Kingdom, serving size in licensed premises is regulated under the Weights and Measures Act (1985). Spirits (gin, whisky, rum, and vodka) are sold in 25 ml or 35 ml quantities or multiples thereof. [7] Beer is typically served in pints (568 ml), but is also served in half-pints or third-pints.

In the Republic of Ireland, serving size is 37.5 ml or multiples thereof. Beer is usually served in glasses of 400 or 500 ml, but may be as much as one liter.

In the Netherlands and Belgium, standard servings are 250 and 500 ml for pilsner; 300 and 330 ml for ales.
[edit] Flavoring

Alcohol is a moderately good solvent for many fatty substances and essential oils. This attribute facilitates the use of flavoring and coloring compounds in alcoholic beverages, especially distilled beverages. Flavors may be naturally present in the beverage’s base material. Beer and wine may be flavored before fermentation. Spirits may be flavored before, during, or after distillation.

Sometimes flavor is obtained by allowing the beverage to stand for months or years in oak barrels, usually American or French oak.

A few brands of spirits have fruit or herbs inserted into the bottle at the time of bottling.
[edit] Uses

In many countries, people drink alcoholic beverages at lunch and dinner. Studies have found that when food is eaten before drinking alcohol, alcohol absorption is reduced[8] and the rate at which alcohol is eliminated from the blood is increased. The mechanism for the faster alcohol elimination appears to be unrelated to the type of food. The likely mechanism is food-induced increases in alcohol-metabolizing enzymes and liver blood flow.[8]

At times and places of poor public sanitation (such as Medieval Europe), the consumption of alcoholic drinks was a way of avoiding water-borne diseases such as cholera. Small beer and faux wine, in particular, were used for this purpose. Although alcohol kills bacteria, its low concentration in these beverages would have had only a limited effect. More important was that the boiling of water (required for the brewing of beer) and the growth of yeast (required for fermentation of beer and wine) would tend to kill dangerous microorganisms. The alcohol content of these beverages allowed them to be stored for months or years in simple wood or clay containers without spoiling. For this reason, they were commonly kept aboard sailing vessels as an important (or even the sole) source of hydration for the crew, especially during the long voyages of the early modern period.

In cold climates, potent alcoholic beverages such as vodka are popularly seen as a way to “warm up” the body, possibly because alcohol is a quickly absorbed source of food energy and because it dilates peripheral blood vessels (peripherovascular dilation). This is a misconception because the “warmth” is actually caused by a transfer of heat from the body’s core to its extremities, where it is quickly lost to the environment. However, the perception alone may be welcomed when only comfort, rather than hypothermia, is a concern.