By egal / Getty Images On October 16, the world will mark World Food Day, an annual event that commemorates the creation of the United Nations Food and Agriculture Organization (FAO). Since the aim is to raise awareness about hunger and poverty in the world, we are revisiting the essential role that one kind of food has always played in our lives: grains. In this era of global warming, their role in our daily lives takes on new forms — an opportunity to look at some lesser known varieties.. On October 16, the world will mark World Food Day, an annual event that commemorates the creation of th…