Only a minority of people pay attention to calorie labelling on menus when it comes to choosing fast food, according to a new research in the US. Researchers in the US found that providing customers in fast food restaurants with information about the food's energy content only deterred one in six people from choosing a more unhealthy option. The survey, which questioned 7,000 people in 2007 and another 8,500 in 2009 - before and after compulsory labelling was introduced in 11 restaurants in New York - found that only 15% of diners changed their eating habits, reducing their intake by an average of 106 calories.