While availability (production and supply) and utilization/adequacy (nutritional status/ anthropometric measurement) are easier to estimate and therefore more popular, accessibility (the ability to acquire a sufficient quantity and quality of food) remains largely elusive.
Thanks to the establishment of a global reference scale and the procedure needed to calibrate measures obtained in different countries, it is possible to use the FIES to produce cross-country comparable estimates of the prevalence of food insecurity in the population.
Beginning in the early 2010s, FAO incorporated more complex metrics into its calculations, including estimates of food losses in retail distribution for each country and the volatility in agri-food systems.
Structural imbalances and a lack of inclusive policies have combined with extreme weather events, altered environmental conditions, and the spread of pests and diseases, such as the COVID-19 pandemic, triggering stubborn cycles of poverty and hunger.
[5] Inequality in the distributions of assets, resources and income, compounded by the absence or scarcity of welfare provisions in the poorest of countries, is further undermining access to food.
On broader measures, the SOFI report found that far more people suffered some form of food insecurity, with 3 billion or more unable to afford even the cheapest healthy diet.
[38][39] FAO's 2021 edition of The State of Food and Agriculture (SOFA) further estimates that an additional 1 billion people (mostly in lower- and upper-middle-income countries) are at risk of not affording a healthy diet if a shock were to reduce their income by a third.
Regions like the Gaza Strip and South Sudan were among the hardest hit, highlighting the urgent need for targeted interventions to address and mitigate global hunger effectively.
The 20th century has examples of governments, such as Collectivization in the Soviet Union or the Great Leap Forward in the People's Republic of China undermining the food security of their nations.
These include supply chain disruptions due to the COVID-19 pandemic, the 2021–2023 global energy crisis, the Russian invasion of Ukraine, and floods and heatwaves during 2021 (which destroyed key American and European crops).
While progress in combating COVID-19 has provided some relief, the pandemic's lasting effects persist, including shifts in consumer behavior and the ongoing necessity for health and safety measures.
[92] The conflict has severely impacted food supply chains with noteworthy effects on production, sourcing, manufacturing, processing, logistics, and significant shifts in demand among nations reliant on imports from Ukraine.
[101] In 2022 the United Nations called attention "considerably negative impact" on food security of the fish oil and fishmeal industries in West Africa.
[104] In 2023, climate change significantly impacted food security, with extreme weather events being primary drivers in 18 countries, affecting over 77 million people.
A recent comprehensive systematic review showed that over 50 studies have shown that food insecurity is strongly associated with a higher risk of depression, anxiety, and sleep disorders.
FAO has stated that "approaches should be human rights-based, target the poor, promote gender equality, enhance long-term resilience and allow sustainable graduation out of poverty.
[3] In 2020, FAO deployed intense advocacy to make healthy diets affordable as a way to reduce global food insecurity and save vast sums in the process.
The Plan of Action set several targets for government and non-governmental organizations for achieving food security, at the individual, household, national, regional, and global levels.
[137] Increased agricultural productivity enables farmers to grow more food, which translates into better diets and, under market conditions that offer a level playing field, into higher farm incomes.
The May 2012 Copenhagen Consensus recommended that efforts to combat hunger and malnutrition should be the first priority for politicians and private sector philanthropists looking to maximize the effectiveness of aid spending.
[150] On 11 November 2021, Human Rights Watch reported that Afghanistan is facing widespread famine due to collapsed economy and broken banking system.
[152] Additionally, the Australian Institute of Family Studies (AIFS), reported that certain demographics are more vulnerable to being food insecure; such as indigenous, elderly, regional, and single-parent households.
[160] Calling food waste "shameful", General Secretary of the Chinese Communist Party, Xi Jinping, launched the Clean Plate campaign.
[164] Millions of DRC inhabitants are living below the poverty line, contributing to this widespread hunger in the country that in some cases is so severe, that families can't afford to eat everyday.
[165] A study showed the correlation of food insecurity and its negative effects on at-risk HIV adults in the Democratic Republic of Congo, exacerbating the vulnerability of these populations even further.
Furthermore, many urban areas are forced to turn to mainly consume bushmeat as their primary source of protein, because they cannot afford to access other types of safer, healthier and even more legal options.
[176] Food insecurity and hunger in the United States of America affects millions of Americans, including some who are middle class, or who are in households where all adults are in work.
Public interventions include changes to agricultural policy, the construction of supermarkets in underserved neighborhoods, investment in transportation infrastructure, and the development of community gardens.
In 2011, a report presented in the New York Times found that among 20 economies recognized as advanced by the International Monetary Fund and for which comparative rankings for food security were available, the U.S. was joint worst.
This was made worse by socioeconomic factors like disease (HIV/AIDS), poverty, and agricultural reasons like land degradation or management (regulation of food production using wetlands).