The introduction of the sugar tax on soft drinks may drive up alcohol consumption if the cost of such drinks rises as a result, a new study suggests.

The levy on sugary drinks may have unintended consequences on the nation’s shopping habits, researchers found.

Experts examined whether price hikes to soft drinks could lead to higher rates of purchase for other drinks – such as alcohol.

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Researchers, led by academics from the London School of Hygiene and Tropical Medicine, used a statistical model to predict the outcomes of increases in the cost of sugar sweetened drinks.

The model used data from the expenditure of 32,000 British households in 2012/13.

They found that people from poorer homes were more likely to buy high-sugar drinks and spirits while richer homes were more likely to buy juices and wine.

According to the model, an increase in the price of high-sugar drinks could lead to an increase in the purchase of lager, diet drinks and juice.

These could “act as substitutes”, the researchers said.

Increases in the cost of diet or low-sugar drinks could lead to hikes in the sales of beer, cider and wines, they found.

But an increase in the price of medium-sugar drinks could actually reduce sales of alcoholic drinks, according to the study, published in the Journal of Epidemiology and Community Health.

But Naveed Sattar, professor of metabolic medicine at the University of Glasgow, said the paper made "many assumptions".

“Doing nothing is not an option," he added. "One has to make a change and then examine consequences, whether good or bad, and learn from this – this is the basis of science and research and continuous improvements in health.”