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b'LONDON\\u2014The health impact of diet and physical activity may play a part in the marked ethnic differences in type 2 diabetes and cardiovascular disease in the UK according to research reported at the London School of Hygiene & Tropical Medicine. In the Pemberton Lecture at the 2012 Meeting of the Society for Social Medicine Professor Peter Whincup of St George\\u2019s London University also said that social class has a big effect on health \\u2014 but not in the same way in all ethnic groups. He explained to Peter Goodwin why the study of ethnicity and health is needed to help reduce inequalities such as a six-fold difference in the incidence of diabetes between communities in the same city.'