Locally manufactured corn grits for animal feed is pictured at a local market in Manila, Philippines February 16, 2016. A legal challenge to the Philippines' rules on genetically modified organisms is threatening to spark a domestic food crisis, potentially setting a precedent for the rest of Asia. Philippines was the first in the region to allow planting and commercialization of GM corn, which it did in 2002, and has permitted GM crop imports for more than a decade. REUTERS/Erik De Castro