Calorie labels encourage people to eat less by only a single crisp, study says

Review of labelling's effectiveness finds average reduction is equivalent of 11 calories in a typical 600-calorie meal

Calorie labels on menus and food packets encourage people to choose healthier options but only to the tune of 11 calories - the same as a single Pringle crisp.

That is the finding of a study into how effective menu listings are at prompting consumers to select less calorific food.