Nairobi, Aug. 31 -- Africa's food production has roughly doubled in real terms over the past two decades, but the gains have failed to keep pace with the continent's growing population and demand, leaving hunger and food insecurity stubbornly high.

A new review of Africa's agrifood sector by the Alliance for a Green Revolution in Africa (AGRA) says farm output has doubled in real terms since 2005, while cereal yields have increased by about 40 percent and farmer incomes doubled.

Agriculture's gross domestic product (GDP) growth also accelerated from about 2.3 percent to almost four percent, reflecting significant expansion of the sector.

But the gains have not translated into overall food security or prosperity for farmers on the conti...