"There has been a sharp increase in food prices, especially of the staple, maize," WFP information officer, Gabrielle Menezes, told IRIN.
A two-kilogramme packet of maize flour, currently retailing at Ksh80 (US $1.3), cost just Ksh50 earlier this year.
"The situation in the arid districts of Turkana and Mandera [northern Kenya] has especially deteriorated, with pastoralists migrating to neighbouring countries in search of pasture," said Menezes.