Alcohol forms part of the diet for over 90% of adults in the UK and is unusual in being both a nutrient and a drug. For many of us, alcohol is a safe and pleasurable part of the diet. However, there is growing concern that many people who see themselves as social drinkers are consuming levels that may cause harm. Understanding how to assess safe levels of alcohol consumption and identify strategies for cutting down can help us to advise our patients how to moderate their intake.