Does listing calories on foods really work in influencing people's diets?

Recent research finds that calorie labelling, e.g. on menus, do have a positive, although small, effect on people's food choices. — Filepic

Calorie labelling on menus and products has a “small”, but “potentially meaningful” effect on people’s food choices, according to a review.

Calorie labels in supermarkets, restaurants and other food outlets led to an average reduction in the calories people selected and purchased of 1.8% – equating to 11 calories in a 600-calorie meal – or around two almonds, evidence from 25 studies suggests.