The whole GMO issue has nothing to do with feeding the poor. GMO grains cost more so the starving proles can't afford to buy the seeds, they just save their current seeds for next year.
Just three corporations control one quarter of the world's seed market (Monsanto, Syngenta and DuPont) and biodiversity is not high on their agenda. National seed lists in many countries make it illegal to buy and sell unusual varieties and it is prohibitively expensive to keep seeds on the list. Agribusinesses require farmers buying seed to sign contracts that prevent them saving and replanting seeds at a later date. As this is difficult to enforce, seeds are now being genetically modified to be sterile after a year in order to protect company's patents, a process known as terminator technology. While this guarantees profits, an estimated 1.4 billion farmers worldwide depend on seeds saved or exchanged with neighbors. The Chilean Rural and Indigenous Network call this copyrighting or patenting of living things 'a crime against humanity'.
Source: A Handbook For Changing Our World by the Trapese Collective.