Introduction
An introduction to alcohol and alcoholic beverages
Guidelines for sensible drinking
Alcohol consumption
Absorption and metabolism of alcohol
Alcohol and nutrition
The burden of disease and mortality related to alcohol
Alcohol and disease risk
Alcohol and other conditions
Alcohol and social issues
Conclusions
Summary Alcohol is produced via the anaerobic fermentation of sugars by yeast and involves glucose molecules (C6H12O6) being broken down to yield ethanol (C2H5OH), carbon dioxide (CO2) and energy. The amount of alcohol contained in different alcoholic beverages varies considerably and is referred to as the ‘strength’ of the drink, which is expressed as the percentage of alcohol by volume (ABV). A standard unit of alcohol in the UK equates to 8 g or 10 ml of pure alcohol. Guidelines for sensible drinking set by the UK government are 3–4 units (24–32 g) a day or less for men, and 2–3 units (16–24 g) a day or less for women. Specific recommendations have been set for those planning pregnancy and pregnant women, who should drink no more than 1–2 units of alcohol once or twice a week and should avoid heavy drinking sessions. Guidelines for sensible drinking are similar in other countries. When taking into account the standard drink unit used to define guidelines, the most commonly recommended limit is 24 g/day for men and 20 g/day for women.
Older people are more likely to drink in line with the sensible drinking guidelines, as they tend to consume alcohol over a period of time, as opposed to consuming large quantities on one or two days of the week, a practice that is more popular among younger people. Consuming double the sensible drinking guidelines in one day is classified as binge drinking (an alternative definition is drinking until intoxicated). It has become recognised that binge drinking is a common phenomenon in the UK, particularly among younger people. Other factors, such as income, ethnicity and region of residence, are also recognised to be predictive of the quantity of alcohol consumed; for example, higher‐income households are more likely to consume large quantities of alcohol and consume alcohol more frequently.
The quantity of alcohol consumed is an important factor in determining how it affects health and well‐being. In terms of nutritional health, chronic excessive alcohol intake is well recognised to affect an individual’s nutrient status, because it reduces food intake and/or may interfere with the digestion, absorption, metabolism and utilisation of some nutrients. However, when consumed in moderation, alcohol is unlikely to interfere with the metabolism of nutrients or be associated with impaired vitamin function or depletion to an extent that may harm health, provided that dietary intakes are adequate. Alcoholic beverages contain alcohol, carbohydrate and only small amounts of some vitamins, trace elements and minerals. They are therefore unlikely to contribute significantly to micronutrient intake. Any association that exists between moderate alcohol consumption and the ...