Servings of rice and noodles in the city's fast food outlets are too large and most diners do not finish the meals they order, a survey has found. Green Sense, a green group that will launch a 'Less-Rice Campaign' tomorrow, observed more than 1,100 diners in 52 major fast-food venues and cha-chan tengs, a popular kind of cafe in Hong Kong. The survey found only about 40 per cent of diners finished the whole plate of rice or noodles they ordered. More than half finished only 70 per cent to 90 per cent of the food. The green group bought and conducted nutrition checks on several meals, such as roast pork and rice and curry beef brisket and rice, from nine cha-chan tengs and three fast-food shops. They found the portions of rice were the equivalent of two or three bowls of rice eaten at home. It also found the portions were about 1,000 kilocalories, or about 40 per cent of an adult's recommended daily calorie intake. 'It is wasteful if you do not finish the whole plate of rice, but if you do you will be exposed to the risks of obesity and heart disease,' said June Chan King-chi, dietitian at the Hong Kong Sanatorium and Hospital, who conducted the nutrition assessment. She said a 65kg man who did little exercise needed 2,340 kilocalories a day, whereas a 55kg woman needed only 1,980 kilocalories. Ms Chan said most people did little exercise during weekdays, and advised people to limit the calories at each meal to 30 per cent of the total recommended daily intake. 'If you finish the whole plate of rice, and then you have a soft drink and a desert, you might have taken in excessive calories,' she added. Green Sense project officer Winnie Chow Wing-yi said restaurants should be flexible. 'The best way to avoid food wastage is to ask for less rice,' she said. More than 3,000 tonnes of food waste was dumped into landfills every day last year, according to Environmental Protection Department figures. Miss Tsang, a supervisor at the Heung Shing cha-chan teng, said restaurant owners had told staff to be flexible in serving portions of food. 'If the customer looks fat or looks like a site worker, we will give an extra portion of rice,' Miss Tsang said. She offered smaller portions if a customer looked like an office worker. Some customers asked for smaller portions of rice, she said. One diner said she supported the less-rice campaign. 'It is always better to order less first, and if you are not full, you can still ask for more later.' she added. Her husband said he preferred dining at home to avoid eating excessive calories.