Filmgoers should be told how many calories there are in the popcorn, ice cream and soft drinks that they buy in cinemas, according to the Food Standard Agency.

    Smaller popcorn buckets and drink cups should also be made , the nutrition inspector said.

    Tim Smith, chief executive of the agency, told The Times that cinemas should help to deal with the country's overweight .

    "There is a misbelief that popcorn is calorie-free, but that is not the case. It is a to us," he said. "Portion sizes are also a big issue, and there seems to be increasingly big packs on sale."

    He spoke as a number of food chains such as Pret A Manger, Wimpey and The Real Greekto put calorie counts on all their menus.

    A trial scheme（试行方案） with 21 food companies took place last summer, and are that consumers altered their buying habits when they realised the number of calories in a product.

    A consultation(征询意见) on the trial ends next month but Mr Smith is already planning the second drive for American-style calorie counts and is  to win support from cinemas and other entertainment places, from football grounds to concert halls.

    Governmentsuggest that two thirds of adults and a third of children are overweight. If trends are not , this could rise to almost nine in ten adults and two thirds of children by 2050, putting them at  risk of heart disease, cancer and other diseases.