Ok this is cut and pasted from
http://www.ias.org.uk/Alcohol-knowledge ... lines.aspxUK low risk drinking guidelines
The current advice from the Department of Health regarding alcohol consumption is that, in order to minimise the risk of health harms associated with drinking:[3]
Men should drink no more than 21 units of alcohol per week, no more than 4 units in any given day, and have at least 2 alcohol-free days a week
Women should drink no more than 14 units of alcohol per week, no more than 3 units in any given day, and have at least 2 alcohol-free days a week
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
Children should not drink alcohol at all, but if they do, they should be at least 15 years old, never drink more than once a week, supervised by a parent or carer, and never exceed the recommended adult daily limits (3–4 units of alcohol for men and 2–3 units for women)
As you will see it states 'minimise the risk'. I don't interpret that as saying it's safe.
And here's a link to an explaination and definition of UK units;
http://en.wikipedia.org/wiki/Unit_of_alcoholAnd I found this on that page;
Recommended maximum
Main article: Recommended maximum intake of alcoholic beverages
From 1992 to 1995 the UK government advised that men should drink no more than 21 units per week, and women no more than 14.[12] (The difference between the sexes was due to the typically lower weight and water-to-body-mass ratio of women[citation needed].) The Times reported in October 2007 that these limits had been "plucked out of the air" and had no scientific basis.[13][14]
This was changed after a government study showed that many people were in effect "saving up" their units and using them at the end of the week, a phenomenon referred to as binge drinking.[citation needed] Since 1995 the advice was that regular consumption of 3–4 units a day for men, or 2–3 units a day for women, would not pose significant health risks, but that consistently drinking four or more units a day (men), or three or more units a day (women), is not advisable.[15]
An international study[16] of about 6,000 men and 11,000 women for a total of 75,000 person-years found that people who reported that they drank more than a threshold value of 2 units of alcohol a day had a higher risk of fractures than non-drinkers. For example, those who drank over 3 units a day had nearly twice the risk of a hip fracture.