The steep rise in incidences of a cancer type in developed countries is due to the increase in the consumption of soft drinks. For instance, the volume of soft drinks consumed in the US increased five-fold in the last 50 years. So did cancer rates
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/hard-impacts
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/soft-drinks
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cancer