Fig. (1) a) showing estimated prevalence of vitamin A deficiency in children aged 6 to 59 months by UNICEF regions [3]; b) UNICEF vitamin A supplementation coverage rates [7]; c) Food and Agriculture Organization (FAO)-estimated food supply quantities of five crops as kg/capita/yr in Sub-Saharan Africa; and d) South Asia. (FAO data: http://faostat3.fao.org/ download/FB/*/E ; For Sub-Saharan Africa, East, West, Mid and South African data were averaged to estimate Sub-Saharan data excluding North; 2011 was latest year available for data).