As defined by the Food and Agriculture Organization of the United Nations, food security exists when all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food that meets their dietary needs and food preferences for an active and healthy life. On the basis of this definition, one can identify opportunities to improve food security at many levels—farm, household, market, agro-processing, retail, cross-border, regional, and global. Governments, civil society, research institutions, and private firms can take steps to help farmers’ understand and use technologies that raise yields, diversify farming systems, or minimize postharvest losses; raise household incomes so more food can be purchased; recognize women as producers, consumers, and family nutrition overseers; improve institutions and infrastructure so food moves efficiently from point of production to points of sale and consumption; and establish environments that allow food businesses to start up and operate efficiently.