The drop in Cuban energy consumption does not seem so different from what e.g. Italy is now going through. But there has been no increase in infant mortality in Cuba, on the contrary it's been dropping. There has been no increase of overall mortality, on the contrary "Manuel Franco describes the Special Period as "the first, and probably the only, natural experiment, born of unfortunate circumstances, where large effects on diabetes, cardiovascular disease and all-cause mortality have been related to sustained population-wide weight loss as a result of increased physical activity and reduced caloric intake"."
Infant mortality dropping:
http://www.indexmundi.com/g/g.aspx?c=cu&v=29
Birth rate dropping:
http://www.indexmundi.com/g/g.aspx?c=cu&v=25
Life expectancy growing:
http://www.indexmundi.com/g/g.aspx?c=cu&v=30
Energy consumption per capita has been dropping, now less than world averadge and fraction compared to North America:
http://www.google.fi/publicdata/explore?ds=d5bncppjof8f9_&met_y=eg_use_pcap_kg_oe&idim=country:CUB&dl=en&hl=en&q=cuba+energy+consumption#!ctype=l&strail=false&bcs=d&nselm=h&met_y=eg_use_pcap_kg_oe&scale_y=lin&ind_y=false&rdim=region&idim=country:CUB&idim=region:NAC&ifdim=region&tdim=true&hl=en_US&dl=en&ind=false
Cuba has a problem of aging population much like Europe, but the traditional family values and socialist community values of health care system seem to be doing better job of taking care of elderly than in many European nations where elderly are institutionlized and medicated into zombies by more and more technocratic and privatized "health care".
What is most noteworthy of all the graphs is that Cuba keeps on doing quite well with very low energy consumption per capita. Areas that are debt slaves to IMF and neoliberalism have practically no chance of following Cuban example of low energy well-fare without revolutions to gain freedom from neoliberal models of oppression, as we see in Greece where IMF is "predicting a 5-10% decrease in Greek life expectancy due to the debt crisis and austerity cuts." (http://stuartbramhall.aegauthorblogs.com/tag/greek-debt/)