Around 27% of quick service restaurants' sales come from snacking, according to research from market information and advisory company, the NPD Group.
A combination of morning, afternoon and late snacking equated to £3.7b of sales and 1.6 billion visits for the year ending in September 2016.
NPD's data showed that the average price per person per snack is £2.39.
London has come out top as the city most likely to snack across the whole of Britain. Snacking is also more appealing to 18- to 24-year-olds as opposed to other age groups, and more females snack than males.
Although there are many snacking options at burger operators and fast-food vendors, the majority (60%) of snacking sales come from retailers, supermarkets and coffee chains, NPD found.
Cyril Lavenant, foodservice director UK at the NPD Group, said: "Snacking was the easiest occasion to cut for consumers looking to make savings during the recession. Consumers are once again finding these small treat occasions relevant in the past couple of years as they feel better about their personal finances and about the future, and also because there are many more snacks on offer. The new range of healthier snacking items (both food and drinks) that are now on the market should boost snacking both in terms of visits and price per item."
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