Afghanistan and nations in sub-Saharan Africa are most at risk from shocks to food supplies such as droughts or floods while Nordic countries are least vulnerable, according to an index released on Thursday. "Of 50 nations most at risk, 36 are located in Africa," said Fiona Place, an environmental analyst at British-based consultancy Maplecroft, which compiled the 163-nation food security risk index. Maplecroft said that it hoped the index could help in directing food aid or to guide investments in food production.