Food system

The term food system describes the interconnected systems and processes that influence nutrition, food, health, community development, and agriculture. A food system includes all processes and infrastructure involved in feeding a population: growing, harvesting, processing, packaging, transporting, marketing, consumption, distribution, and disposal of food and food-related items. It also includes the inputs needed and outputs generated at each of these steps.

Food systems fall within agri-food systems, which encompass the entire range of actors and their interlinked value-adding activities in the primary production of food and non-food agricultural products, as well as in food storage, aggregation, post-harvest handling, transportation, processing, distribution, marketing, disposal, and consumption. A food system operates within and is influenced by social, political, economic, technological and environmental contexts. It also requires human resources that provide labor, research and education. Food systems are either conventional or alternative according to their model of food lifespan from origin to plate. Food systems are dependent on a multitude of ecosystem services. For example, natural pest regulations, microorganisms providing nitrogen-fixation, and pollinators.

According to the IPCC, the global food system, including all of the various industries involved in sustainable and conventional food systems, provide employment for 1 billion people. This global food system is facing a number of challenges created by impeding global food security issues created by climate change and non-climate change stresses on the system. About 34% of total greenhouse gas emissions are attributable to the global food system. In 2020 an EU evidence review found that food system gas emissions are on course to increase by 30–40% by 2050 due to population growth and dietary change. It is crucial to build the resilience of agrifood systems so that they have the capacity over time, in the face of any disruption, to sustainably ensure availability of and access to sufficient, safe and nutritious food for all, and sustain the livelihoods of agrifood systems' actors.

Transitioning to sustainable food systems is critical for addressing global challenges such as climate change, hunger, biodiversity loss, and deforestation. Addressing issues at each stage in the system, can have system-wide effects for 30–40 percent of food produced is lost from post-harvest up to retail and the consumer. Reducing food waste then reduces the environmental impacts of agriculture, such as land use impacts, and reducing food prices or preventing shortages. International policy has increasingly approached policy from a food systems perspective: Sustainable Development Goal 2: Zero Hunger and Sustainable Development Goal 12: "responsible consumption and production" focus on sustainable food systems and Sustainable and in September 2021 the United Nations hosted the first Food Systems Summit.

Conventional food systems operate on economies of scale. These food systems are geared towards a production model that requires maximizing efficiency in order to lower consumer costs and increase overall production, and they utilize economic models such as vertical integration, economic specialization, and global trade. The growing soil quality degradation, climate change, and growing world population put pressure on agricultural land, leading to innovations to increase agricultural productivity on the limited available land and urban space. Though conventional farming practices have increased crop yield through the use of climate-smart agriculture (CSA), smallholder farming systems and limited knowledge of CSA remain constraints for enjoying economies of scale and sustainable crop production and food security.

The term "conventional" when describing food systems is largely due to comparisons made to it by proponents of other food systems, collectively known as alternative food systems.

The development of food systems can be traced back to the origins of in-situ agriculture and the production of food surpluses. These surpluses enabled the development of settled areas and contributed to the development of ancient civilizations, particularly those in the Fertile Crescent. The system of trade associated with the exchange of foodstuffs also emerged in East Asia, North America, South America, and Subsaharan Africa with common commodities of exchange such as salt, spices, fish, grains, etc. Through events in world history such as the conquests of Alexander the Great, the Crusades, the expansion of Islam, the journeys of Marco Polo, and the exploration and colonization of the Americas by Europeans led to the introduction and redistribution of new foods to the world at large, and food systems began to intermingle on a global scale. After World War II, the advent of industrialized agriculture and more robust global trade mechanisms have evolved into the models of food production, presentation, delivery, and disposal that characterize conventional food systems today.

The development of conventional food systems is directly responsible for decreased food prices and increased food variety. Agronomic efficiency is driven by the necessity to constantly lower production expenses, and those savings can then be passed on to the consumer. Also, the advent of industrial agriculture and the infrastructure built around conventional food systems has enabled the world population to expand beyond the "Malthusian catastrophe" limitations. According to the IPCC, food supply per capita has increased by more than 30% since 1961.