London - Cereal bars marketed as "healthy" alternatives to a proper breakfast could be bad for you, a British food campaign group said yesterday. Tests on 18 popular cereal bars by the Food Commission showed that all were top-heavy in artery-clogging saturated fats or sugars. Worst of the bunch, said the commission, was a Coco Pops bar which beat milk chocolate with a 41 per cent calorie haul from sugar and a Tracker banana breakfast bar loaded with 43 per cent of calories from fat.