Recommended Safe Limits of Alcohol

Authored by Dr Roger Henderson, 20 Apr 2016

Patient is a certified member of
The Information Standard

Reviewed by:
Dr Laurence Knott, 20 Apr 2016

See your doctor or practice nurse if you are drinking above the recommended limits of alcohol and are finding it difficult to cut down.

  • Men should drink no more than 14 units of alcohol per week, these units should be spread out through the week and they should have at least two alcohol-free days a week.
  • Women should drink no more than 14 units of alcohol per week, these units should be spread out through the week and they should have at least two alcohol-free days a week.
  • Pregnant women. Advice from the Department of Health states that ... "pregnant women or women trying to conceive should not drink alcohol at all. If they do choose to drink, to minimise the risk to the baby, they should not drink more than 1-2 units of alcohol once or twice a week and should not get drunk".
  • The Department of Health published draft guidelines in January 2016 that contain these recommendations. 14 units is roughly a bottle and a half of wine or five strong pints of beer.
  • The House of Commons Science and Technology Committee advises that people should have at least two alcohol-free days a week.
  • Some would argue that the upper limits of the recommendations are too high. For example, one study found that drinking more than two units a day for men and more than one unit a day for women significantly increases the risk of developing certain cancers.

Your liver processes alcohol. It can only cope with so much at a time. Drinking more alcohol than the liver can cope with can damage liver cells and produce toxic by-product chemicals.

The more you drink, and especially above the recommended limits, the greater the risk of developing or experiencing serious problems such as:

  • Liver disease (cirrhosis or hepatitis).
  • Cancer.
  • Gut and pancreas disorders.
  • Depression.
  • Anxiety.
  • Sexual difficulties.
  • Muscle and heart muscle disease.
  • High blood pressure.
  • Damage to nervous tissue.
  • Serious accidents.
  • Obesity (alcohol is calorie-rich).

See separate leaflet called Alcohol and Sensible Drinking for more details.

During pregnancy

Alcohol gets to a baby through the placenta if a pregnant woman drinks alcohol. A baby cannot process alcohol very well. So, any alcohol in your baby stays in their body much longer than in you. This is known to be a risk for causing serious problems such as:

  • A low birth weight.
  • Learning, behavioural, and thinking (cognitive) problems.
  • Defects of the heart and other organs.
  • Abnormal facial features.

When these problems are severe, the condition is called fetal alcohol syndrome.

However, there has been debate over the years as to whether small amounts of alcohol are safe to drink during pregnancy. Also, if there is a time of pregnancy when alcohol is most likely to cause harm. But, recent research supports the advice of not drinking any alcohol whilst pregnant.

For example, a study by Feldman et al (cited below) looked at the relationship between drinking alcohol during pregnancy and it causing facial defects in the baby. This study showed that the more alcohol a woman drank, the more likely there was to be a facial defect in the baby. BUT, there was no safe amount of alcohol to drink during pregnancy, as there was still some risk with small amounts of alcohol. The study also found that drinking alcohol has risks throughout pregnancy, but it may be most likely to cause facial defects during weeks 6-12 of pregnancy. The authors of the study concluded that ... "women should continue to be advised to abstain from alcohol consumption from conception throughout pregnancy."

One unit of alcohol is 10 ml (1 cl) by volume, or 8 g by weight, of pure alcohol. For example:

  • One unit of alcohol is about equal to:
    • Half a pint of ordinary strength beer, lager or cider (3-4% alcohol by volume); or
    • A small pub measure (25 ml) of spirits (40% alcohol by volume); or
    • A standard pub measure (50 ml) of fortified wine such as sherry or port (20% alcohol by volume).
  • There are one and a half units of alcohol in:
    • A small glass (125 ml) of ordinary strength wine (12% alcohol by volume); or
    • A standard pub measure (35 ml) of spirits (40% alcohol by volume).

But remember, many wines and beers are stronger than the more traditional ordinary strengths. A more accurate way of calculating units is as follows: the percentage alcohol by volume (% abv) of a drink equals the number of units in one litre of that drink. For example:

  • Strong beer at 6% abv has six units in one litre. If you drink half a litre (500 ml) - just under a pint - then you have had three units.
  • Wine at 14% abv has 14 units in one litre. If you drink a quarter of a litre (250 ml) - two small glasses - then you have had three and a half units.

Some other examples

Three pints of beer, twice a week, could be 12-18 units per week, depending on the strength of the beer.  That could be just within or above the upper weekly safe limit for a man. In addition, each drinking session of three pints is at least six units, which is more than the safe limit advised for any one day. Another example: a 750 ml bottle of 12% wine contains nine units. If you drink two bottles of 12% wine over a week, that is 18 units. This is above the upper safe limit for both men and women.

For men aged over 40 and for women past the menopause, it is thought that drinking a small amount of alcohol helps to protect against heart disease and stroke. The exact amount is not clear, but it is a small amount. So, do not exceed the recommended amount of alcohol as described above in a mistaken belief that it may be good for the heart.

Further reading and references

During my research on hereditary emotions I have no doubt that feelings are hereditary, even phobias.If this is fact what are we passing onto our kids if we drink in excess. Over 20 years ago there...

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