Congo's food shortages are caused by poverty, poor agriculture development, mineral conflicts, and poor transportation infrastructure.
Poverty is a major source of food vulnerability but not the only one, said the study by Maplecroft, a Britain-based firm that provides risk intelligence for businesses.
"Food security is also affected by agricultural development, trade flows, foreign aid as well as government policies on nutrition," said Alyson Warhurst, a professor at Warwick Business School in central England and co-director of Maplecroft. "Added to these are the impacts of population growth and climate change," she told AFP.
The five countries topping the risk list -- Angola, Haiti, Mozambique, Burundi and Democratic Republic of Congo -- are all mired in poverty, but other factors also boost vulnerability.