If a bottle of wine opened in the evening seems to magically always disappear, there could be a reason.
When a glass of wine is in front of them, many people underestimate how much wine it actually contains, new research suggests.
It could explain why the measures served at home are often larger than those served at bars and restaurants, and why people often over-indulge at Christmas parties.
Almost three-quarters of adults underestimate the amount of wine in a 250ml glass, according to a survey by Direct Line Motor Insurance.
How many units are in these two glasses? Only 15 per cent guessed right for wine, whereas 23 per cent knew the answer for gin. SCROLL TO THE BOTTOM FOR ANSWERS
Shown the large glass, containing a third of a bottle, 70 per cent believed it was a medium or small glass.
When shown a serving of gin in a glass, just 22 per cent correctly identified a double measure.
Some 59 per cent of people asked believed the double measure to be only a single measure.
Responding to a survey of 2,000 people, Andrew Misell, from Alcohol Change UK, said: ‘We’ve seen a big shift in drinking habits in recent years with more and more of us drinking at home.
‘But, as this study has shown, many people are unsure of the size of the drinks they pour themselves, and often underestimate how much they’re having.
‘This can lead to them drinking more than they intended without realizing.
‘If