Hyderabad, Nov 21, 2016 : Pollution is taking its toll on not just nature but also the food we consume. Scientists from the National Institution of Nutrition, in a recently published study, reported heavy concentrations of heavy metals like Arsenic, Nickel, Cadmium and Lead in fish samples they had obtained from various outlets in Hyderabad and Secunderabad. The study was led by Dr J. Sreenivasa Rao of the Food Chemistry division of NIN. A variety of commonly consumed fish varieties were checked for the study.