In politics, humanitarian aid, and the social sciences, hunger is defined as a condition in which a person does not have the physical or financial capability to eat sufficient food to meet basic nutritional needs for a sustained period. In the field of hunger relief, the term hunger is used in a sense that goes beyond the common desire for food that all humans experience, also known as an appetite. The most extreme form of hunger, when malnutrition is widespread, and when people have started dying of starvation through lack of access to sufficient, nutritious food, leads to a declaration of famine. Throughout history, portions of the worlds population have often suffered sustained periods of hunger. In many cases, hunger resulted from food supply disruptions caused by war, plagues, or adverse weather. In the decades following World War II, technological progress and enhanced political cooperation suggested it might be possible to substantially reduce the number of people suffering from hunger. While progress was uneven, by 2014, the threat of extreme hunger had receded for a large portion of the worlds population. According to the FAOs 2021 The State of Food Security and Nutrition in the World (SOFI) report, the number of people suffering from chronic hunger began to rise gradually between 2014 and 2019. In 2020, there was a significant increase, resulting in 768 million people suffering from malnutrition.While most of the worlds people continue to live in Asia, much of the increase in hunger since 2015 occurred in Africa and South America.
How the impacts on the different dimensions of food security play out and affect the food security of different population groups depends on where in the food supply chain the reduction in losses or waste takes place as well as on where nutritionally vulnerable and food-insecure people are located geographically.In April and May 2020, concerns were expressed that the COVID-19 pandemic could result in a doubling in global hunger unless world leaders acted to prevent this. Agencies such as the WFP have warned that this could include the number of people facing acute hunger rising from 135 million to about 265 million by the end of 2020. Indications of extreme hunger have been seen in various cities, such as fatal stampedes when word spread that emergency food aid was being handed out. Letters calling for co-ordinated action to offset the effects of the COVID-19 pandemic have been written to the G20 and G7, by various actors including NGOs, UN staff, corporations, academics and former national leaders. Following the 2022 invasion of Ukraine, concerns have been raised over hunger resulting from rising food prices. This is forecast to risk civil unrest even in many middle income countries, where government capability to protect their populations was largely exhausted by the Covid pandemic, and has not yet recovered. Hunger relief organisations
Many thousands of hunger relief organisations exist across the world. Some but not all are entirely dedicated to fighting hunger. They range from independent soup kitchens that serve only one locality,  to global organisations.