The data space around this is so complex, it is simply not possible to come to single, clear conclusions.<p>Lots of interesting questions, no answers to date:<p>1., Did the introduction of electricity and mass refrigeration amplify/cause the deterioration of public health?<p>2., Did the massive losses of young, fit, male population in WW1 and WW2 lead to the decline of public health in the partaking nations? It stopped fine genetic material from procreating (you needed to fulfill health standards to serve after all). Losses of that scale were not encountered before.<p>etc etc.<p>Correlation, causation, the usual.