Mars, Snickers, and Twix 100kcal or less bars are now available at a reduced size in a 40p single bar and a £2.79 multi-pack, alongside the full-sized bars.
The launch follows research which found that consumers are becoming more conscious of the choices they make, and nearly 50% of shoppers consider the portion size of snacks when they are shopping and one in four say that calorie labelling impacts their purchase decisions.
Kerry Cavanaugh, Mars Wrigley marketing director, said: “Our new 100 calorie format gives consumers their favourite brands original recipes but in a size that is a meaningful snacking choice.
“This new range is for consumers who want a sweet treat but in a smaller portion size.
“These chocolate bars are perfect for the 68% of Brits who have said they would rather have less of their favourite chocolate than a larger amount of a lower-sugar chocolate.”