Book excerpt: Important signs of progress in food security and nutrition and a commitment to sustainable development marked 2016. Yet challenges arising from dramatically changing political, economic, and demographic landscapes are sure to test the international momentum behind the new sustainable development agenda. As rapid urbanization continues around the world, poverty, food insecurity, and malnutrition are increasingly becoming urban problems. This rapid shift is changing diets and reshaping food chains—from small farms to modern supermarkets. Going forward, policies and investments to end hunger and malnutrition must take account of the needs of poor urban populations and develop strong links between rural food producers and urban markets to support both rural and urban populations.