(Reuters) - The world has to act against hunger, which affects 13 percent of the population, if it wants to strengthen global security, a candidate to run the U.N. Food and Agriculture Organization said on Tuesday.

Franz Fischler, an Austrian who is former EU agriculture commissioner, said during an interview the whipsaw effect of volatile food prices complicates the effort to expand local production and improve the welfare of subsistence farmers. Prices spiked in mid-2008, plunged in 2009 and hit a record high early this year.