A new study of health trends in China finds, perhaps unsurprisingly, that rapid economic development over the past few decades has been accompanied by a decline in ‘diseases of poverty’ like malaria and child malnutrition but a rise in the diseases of the rich world like heart disease and obesity.One surprising – and not completely understood or explained – finding out of the study is that China appears to be the undisputed world leader for certain cancers: Liver, stomach and esophageal.