The Alcohol Health Alliance UK (AHA), which represents more than 60 health organisations, looked at the calorie and sugar content of 30 bottles of red, white, rose, fruit and sparkling wine sold in the UK.

It concluded that not only was there a wide variation of sugar and calories across different wines but that consumers were "being kept in the dark" about what they were drinking as crucial information was missing from most labels.

Consumer information, it said, was "woefully inadequate".

Government guidelines recommend adults should consume no more than 30g of so-called free sugars per day. The AHA study showed it was possible to reach almost this entire amount by drinking two medium glasses of wine.

But not only was sugar content high - the study also showed that just two medium-sized glasses of the most calorific wines analysed contained more calories than a McDonald's burger.

The AHA analysis suggested many of the most sugar-packed wines were the ones which had the lowest strength of alcohol while wines with high calorie content tended to be higher strength drinks.

It said that with no legal requirement to display sugar content on alcohol labels, drinkers may opt for a lower-strength alcohol thinking that this was a healthier option - but could unwittingly be upping their daily sugar intake.

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None of the 30 products examined in the study displayed sugar content on their labels - information which is required for all non-alcoholic drinks.

'Absurd'

Calorie content was only displayed on 20% of the labels examined.

Professor Sir Ian Gilmore, chairman of the Alcohol Health Alliance UK, said: "Alcohol's current exemption from food and drink labelling rules is absurd.

"Shoppers who buy milk or orange juice have sugar content and nutritional information right at their fingertips.

"But this information is not required when it comes to alcohol - a product not just fuelling obesity but with widespread health harms and linked to seven types of cancer.

"The government must publish its planned consultation on alcohol labelling without further delay - which we have been waiting for since 2020.

"As well as calorie labelling and nutritional information, we need prominent health warnings and the UK Chief Medical Officers' low-risk weekly drinking guidelines on labels.

Alcohol kills 70 people a day

"Studies suggest that this could help reduce alcohol harm by increasing knowledge of the health risks and prompting behaviour change."

Alison Douglas, chief executive of Alcohol Focus Scotland, added: "Alcohol labelling is woefully inadequate in this country and allows the alcohol industry to decide what information it will and won't include on its products, despite alcohol claiming the lives of 70 people a day in the UK.

"The alcohol industry have dragged their feet for long enough - unless labelling requirements are set out in law, we will continue to be kept in the dark about what is in our drinks.

"People want and need reliable information directly on bottles and cans, where it can usefully inform their decisions."