They are often seen as a healthy alternative to breakfast or chocolate treats , but it seems cereal bars may be better suited to the confectionery aisle . Research by Which ? found that some cereal bars – including those aimed at children – contain more than 40 per cent sugar . The consumer group analysed the amount of sugar in 15 leading bars and breakfast biscuits and found many of them were not as healthy as most would think . Scroll down for video . Which ? survey found Kellogg ’ s Coco Pops Snack Bar , which contains 42 % sugar , was the worst offender . Kellogg ’ s Strawberry Nutri-Grain bars contain 31 % whole grain cereal , but are also made up of 33 % sugar . The worst offender was Kellogg ’ s Coco Pops Snack Bar which contained 42 per cent sugar . Other bars marketed at children , such as the popular Choc Chip Harvest Chewee Milk , were also high in sugar and saturated fat . And while Kellogg ’ s Strawberry Nutri-Grain Fruit Breakfast Bars contain 31 per cent whole grain cereal , they were found to be made up of 33 per cent sugar . Which ? is now calling for clear nutrition labelling on the front of all packs to alert consumers to the amount of sugar they contain . Its executive director Richard Lloyd said : ‘ It ’ s worrying that cereal bars , especially those aimed at children or claiming to be healthy , contain so much sugar but most don ’ t make this clear on the front of the pack . ‘ We now want the Government to tackle this issue head on by making sure all manufacturers use traffic light nutrition labelling , encouraging reductions in sugar , fat and salt and ensuring manufacturers promote their products responsibly. ’ The study found only one of the products , Mars ’ s Tracker Bar , had the ‘ traffic light ’ nutrition labelling making it clear to the buyer that the bars are high in sugar and fat . Only the Mars Tracker Bar ( pictured ) had the ‘ traffic light ’ nutrition labelling making it clear to buyers that the bars are high in sugar and fat . The lowest level of the sugar found in the 15 bars was in Quaker Oat So Simple Golden Syrup Morning Bar . The lowest level of the sugar found in the 15 bars was in the Quaker Oat So Simple Golden Syrup Morning Bar which contains just over 15 per cent . A Which ? survey of more than 2,100 adults also revealed that around one in four were happy with the action Government and manufacturers were taking to help people to eat healthily . They also told the watchdog they wanted government to encourage the food industry to lower sugar , fat and salt content in their products and to not promote unhealthy food to children . A Kellogg ’ s spokesman said : ‘ There are less than two teaspoons of sugar in a Coco Pops Snack Bar – that ’ s 9 per cent of your recommended intake . ‘ We clearly label all our foods so people can make informed decisions about what they buy. ’ Which ? released the survey results and made the packaging plea yesterday to mark World Consumer Rights Day . The annual event recognises the moment in 1962 when US President John F Kennedy first outlined the definition of Consumer Rights . The focus this year is on healthier diets .
Which ? analysed amount of sugar in leading bars and breakfast biscuits . Research found some cereal bars are not as healthy as most would think . Kellogg ’ s Coco Pops Snack Bar was the worst offender with 33 % sugar . Kellogg ’ s Strawberry Nutri-Grain Fruit Breakfast Bars made of 42 % sugar . Choc Chip Harvest Chewee Milk is also high in sugar and saturated fat .