Putting calories on food labels and menus "is no silver bullet" say researchers, who analysed the best evidence to date on how effective the policy can be.A review of 25 studies on calorie labelling in a number of countries found a small reduction in the calories people chose to eat - equivalent to two almonds - but even this modest effect could help prevent adults putting on weight as they get older.

Calorie labels in supermarkets and restaurants have little impact on consumer choices, researchers found, fueling doubts about whether the practice is worth keeping.

Calorie labels on menus have a small but meaningful impact on people's choices, according to a new systematic review.

A new review has suggested calorie labels on menus and food packaging has a "real, albeit modest, effect" on people's food choices. But others have called for more evidence on the effect of possible harms.

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.