Alcoholic beverage
Alcoholic beverages are drinks containing ethanol, popularly called alcohol.Alcoholic beverages have been widely used since the remote antiquity by many civilizations around the world, as a component of the standard diet, for hygienic reasons, for their relaxant effects, as recreational drugs, or many other reasons. They have often been invested with symbolic or religious significance, e.g. in Christian Eucharist and Jewish Passover.
At the same time, the use of alcoholic beverages can create chemical dependency to ethanol (alcoholism), which in many societies has become a major health problem, public as well as private. Alcoholism often leads to social and financial ruin, and sometimes to early death. Moreover, the psychological and neurological effects of alcohol have often been a cause of serious accidents and crimes. For these and other reasons, some religions — most notably Islam and Buddhism — ban the consumption of alcoholic beverages, and many governments regulate or restrict them in many ways.
The ethanol in alcoholic beverages is almost always produced by fermentation, i.e. the metabolism of carbohydrates (usually sugars) by certain species of yeast in the absence of oxygen. The process of culturing yeast under conditions that produce alcohol is referred to as brewing.
Yeasts cannot grow when the concentration of alcohol is higher than about 14% in volume, so that is a practical limit for the strength of fermented beverages such as wine, beer, and sake. Drinks with a higher concentration of alcohol can be produced by distillation of the fermented product.
Finally alcoholic beverages can be combined at the time of serving, sometimes with other ingredients, to create cocktails.
In many countries, alcoholic beverages are commonly consumed at the major daily meals (lunch and dinner).
In areas and eras with poor public sanitation, consumption of alcoholic beverages (particularly weak or "small" beer) was one method of avoiding water-borne diseases such as the cholera. Though strong alcohol kills bacteria, the low concentration in beer or even wine will not suffice. It is rather the boiling of water, which is required for the brewing of beer, which sanitizes it.
Most countries have rules forbidding the sale of alcoholic beverages to children, e.g. in the Netherlands one has to be 16 to buy beer or wine and 18 to buy distilled alcoholic beverages. Also there are restrictions on driving after drinking.
In law, sometimes the term "intoxicating agent" is used for a category of substances which includes alcoholic beverages and some drugs. Giving a person these to create an abnormal condition of the mind (such as drunkenness), in order to facilitate committing a crime, may be an additional crime.
The consumption of alcoholic beverages is legal in the western world, but illegal in Muslim countries. During the period known as Prohibition, from 1919 to 1933, it was also illegal in the United States.
Most countries have laws against drunk driving, driving with a certain concentration of ethanol in the blood. The legal threshold of blood alcohol content ranges from 0.1% to 0.08%, 0.05% and even 0% in different countries.
Most countries also specify a legal drinking age, below which the consumption of alcohol is prohibited. In the US, the legal age in every state is 21.
In many countries, production of alcoholic beverages requires a license, and alcohol production is taxed. In the U.S., the Bureau of Alcohol, Tobacco, Firearms, and Explosives and the Alcohol and Tobacco Tax and Trade Bureau (formerly one organization known as the Bureau of Alcohol, Tobacco and Firearms) enforce regulations related to alcohol. In the UK the Customs and Excise department issues distilling licences.
A common after-effect of ethanol intoxication is the extremely unpleasant sensation known as hangover, which is partly due to the dehydrating effect of ethanol. Hangovers can be mitigated by drinking plenty of water between and after alcoholic drinks.
Alcoholism, the dependency on alcohol, is a major public health problem. Alcoholics develop a number of health problems, with cirrhosis of the liver being the most important one.
Excessive alcohol consumption during pregnancy may cause a series mental and physical defects in the child, a problem known as the fetal alcohol syndrome.
The CNS depressant effect likely is due to ethanol's acting on the BK channels. A BK channel is a calcium dependent potassium channel.
It has been known to act on GABA receptors, but this is probably just a secondary effect from activation of the BK channels. It's effect on GABA receptors is probably similar to the action of benzodiazepines such as diazepam. GABA is an inhibitory neurotransmitter, meaning it acts to slow down or inhibit nerve impulses. Ethanol increases the effectiveness of GABA acting through GABAA receptors. When used over a long time, ethanol changes the number and type of GABA receptors, and this is thought to be the cause of the violent withdrawal effects of alcoholics.
Ethanol also interferes with synaptic firing and causes the death of brain cells. This cell death is caused by an increased concentration of intracellular calcium which weakens the electrochemical gradient across the cell membranes. It is this gradient which is the motive force of membrane pumps and channels (cells, especially neurons, quickly die without proper membrane pump and channel function). There is also direct damage to cell membranes from free-radicals that are produced from alcohol metabolism.
The alcohol dehydrogenase of women is less effective than that of men. Combined with the lower amount of water in women's bodies, this means that women typically become drunk earlier than men. Some people, especially in East Asia, have a genetic mutation in their alcohol dehydrogenase gene, resulting in less potent alcohol dehydrogenase. These people are unable to drink much alcohol before becoming drunk, and are therefore less susceptible to alcoholism.
Drugs like disulfiram block the enzyme acetaldehyde dehydrogenase, thus leading to a buildup of acetaldehyde after alcohol consumption. This causes severe hangover symptoms, and the drugs are therefore used to support treatment of alcoholism.
Overconsumption can therefore lead to dehydration (the loss of water).
It is difficult to replenish the body's fluids using only alcoholic beverages. As large amounts of alcohol are consumed, the diuretic effect causes the body to lose more water than is contained in the beverage.
Alcoholic beverages include low-alcohol-content beverages produced by fermentation of sugar- or starch-containing products, and high-alcohol-content beverages produced by distillation of the low-alcohol-content beverages. Sometimes, the alcohol content of low-alcohol-content beverages is increased by adding distilled product, particularly in the case of wines. Such fortified wines include Port wine and Sherry.
Chemistry of alcoholic beverages
Alcoholic content
The amount of alcohol in an alcoholic beverage may be specified in percent alcohol by volume (ABV), in percentage by weight (sometimes abbrieviated w/w for weight for weight), or in proof.Flavoring
Ethanol is a moderately good solvent for many "fatty" substances and essential "oils", and thus facilitates the inclusion of several coloring, flavoring, and aromatic compounds to alcoholic beverages, especially to distilled ones. These flavoring ingredients may be naturally present in the starting material, or may be added before fermentation, before distillation, or before bottling the distilled product. Sometimes the flavor is obtained by allowing the beverage to stand for months or years in barrels made of special wood, or in bottles where scented twigs or fruits — or even insects — have been inserted.Uses
Legal considerations
Effects on the human body
Alcoholic intoxication
In small amounts, ethanol causes a mild euphoria and removes inhibitions. In larger doses, ethanol acts as a central nervous system (CNS) depressant and causes drunkenness (at a blood ethanol content of about 0.1%). At higher contents, alcohol causes intoxication, coma and death. A blood ethanol content above 0.4% is generally fatal, although regular heavy drinkers can tolerate somewhat higher levels than non-drinkers.Action on the brain
Ethanol is quickly absorbed into the bloodstream and reaches the brain. As a small molecule, it is able to cross the blood-brain barrier. The euphorizing effects of ethanol are probably due to its causing the release of endorphins, natural "feel-good" molecules. Metabolism of alcohol and action on the liver
The liver contains a special enzyme (alcohol dehydrogenase) that breaks down alcohols into acetaldehyde, which is turned into acetic acid by the enzyme acetaldehyde dehydrogenase, and then yet another enzyme converts the acetate into fats or carbon dioxide and water. The fats are mostly deposited locally which leads to the characteristic "beer belly". Chronic drinkers, however, so tax this metabolic pathway that things go awry: fatty acids build up as plaques in the capillaries around liver cells and those cells begin to die, which leads to the liver disease cirrhosis. The liver is part of the body's filtration system and if it is damaged then certain toxins build up thus leading to symptoms of jaundice.Dehydration
Consumption of ethanol has a rapid diuretic effect, meaning that more urine than usual is produced. Ethanol inhibits the production of antidiuretic hormone, and this is the cause of the diuretic effect.Hangover
After overconsumption of ethanol, a hangover develops with symptoms of dry mouth, headache, nausea and light sensitivity. These symptoms are partly due to the toxic acetaldehyde produced from alcohol by alcohol dehydrogenase, and partly due to general dehydration. Benefical effects of alcohol
Several studies have suggested that regular consumption of small amounts of specific kinds of alcohol (especially red wine) may lower the incidence of coronary heart disease. However, it is unclear whether the benefits identified are due to the alcohol itself, or rather to other compounds, such as polyphenols found specifically in red wine (and also red grapes and red grape juice). The effects could also be due to life-style differences, since wine drinkers are typically more affluent, exercise more, and eat healthier than the average population. Types of alcoholic beverages
Non-distilled beverages
Distilled beverages
The names of the beverages are determined by the source of the material fermented:
| Source | Name of fermented beverage | Name of distilled beverage |
|---|---|---|
| grain | beer, ale, sake (rice) | whiskey (also spelled whisky) |
| juice of fruits, other than apples or pears | wine (most commonly from grapes) | brandy, grappa (Italy), trester (Germany) |
| juice of appless | ("hard") cider | applejack (or apple brandy), Calvados |
| juice of pears | perry, or pear cider | pear brandy |
| juice of sugarcane, or molasses | basi, betsa-betsa (regional) | rum, cachaÃÂça |
| juice of agave | pulque | tequila, mezcal |
| juice of plums | plum wine | slivovitz |
| honey | mead |
Note that in common speech, wine or brandy is made from grapes unless the fruit is specified: "plum wine" or "cherry brandy" for example, although in some cases grape-derived alcohol is added.
In the USA, cider often means unfermented apple juice (see the article on cider), while fermented cider is called hard cider. Unfermented cider is sometimes called sweet cider. Also, applejack was originally made by a freezing process described in the article on cider which was equivalent to distillation but more easily done in the cold climate of New England. In the UK, cider is always alcoholic, and in Australia it can be either.
Two common distilled beverages not listed in the above chart are vodka and gin. Vodka can be distilled from any source (grain and potatoes being the most common, also industrial cellulose for the cheapest!) but the main characteristic of vodka is that it is so thoroughly distilled as to exhibit none of the flavors derived from its source material. Gin is a similar distillate which has been flavored by contact with herbs and other plant products, especially juniper berries, from which it gets its name.