A U.N. food agency is pushing a new kind of diet for a hungry world. It’s hailing the likes of grasshoppers, ants and other members of the insect world as an underutilized food for people, livestock and pets. A new report says 2 billion people worldwide already supplement their diets with insects. Insects are high in protein and minerals, need far less feed per kilo of mass than cattle do and produce far less greenhouse gas.