In a shocking revelation, Delhi-based research group Centre for Science and Environment has found in its study that most the bread brands and food items sold by popular fast-food brands contains cancer causing chemicals.The reports said about 84% of 38 popular brands of breads, buns and burgers and pizzas were found to contain Potassium Bromate and Iodate that are known as cancer causing agents and are banned in most of the countries but not in India.“Use of chemical food additives is a common practice in packaged and processed foods. Not all of them are safe.