Article: Hunger

For the novel Hunger by Knut Hamsun, see Hunger (novel).

For the 1983 horror film, see The Hunger.

See also Hunger (disambiguation).

Hunger is a feeling experienced by animals when the glycogen level of the liver falls below a certain point. The usually unpleasant feeling originates in the hypothalamus and is released through receptors in the liver and stomach. An average nourished human can survive about 50 days without food intake, but only three days without fluids. Hunger can also be applied metaphorically to cravings of other sorts.

The term is commonly used more broadly to refer to cases of widespread malnutrition or deprivation among populations, usually due to poverty, political conflicts or instability, or adverse agricultural conditions (famine).

Hunger as a condition

The term hungry is commonly used to mean having an appetite for food or to be ready for a meal. After a long period without food, the mild sensation of hunger associated with being ready for a meal becomes progressively more severe, until it is acutely painful. As hunger grows, most living things will experience some internal effects. In humans and other animals, hunger can cause a gurgling sound with a bubbling feeling in the small intestine (many mistakenly think the stomach does this), and can shrink the stomach. Prolonged hunger will drive people to eat substances with no nutritional value (such as grass and soil) simply to fill their stomachs, but doing so actually has an adverse effect on energy balance as energy is still required to digest these substances.

Sometimes hunger is defined as the condition in which an organism can only use its protein tissue (e.g. muscles) as the source of energy, a state which sets in after all sugars and fats etc. are used up.

Extreme hunger is a symptom of diabetes [1].

Hunger is mediated by several molecular signalling pathways in mammals. Hormones known to affect hunger include ghrelin, leptin, and Peptide YY3-36 [2].

In contrast to hunger, which is involuntary, fasting is the practice of voluntarily not eating for a period of time. A hunger strike is fasting for the purpose of nonviolent resistance.

Politics of hunger

The orange ribbon - an awareness ribbon for hunger.

As of 2006, hunger continues to be a worldwide problem. According to the Food and Agriculture Organization of the United Nations, "850 million people worldwide were undernourished in 1999 to 2005, the most recent years for which figures are available" and the number of hungry people has recently been increasing. An orange awareness ribbon is used to raise awareness of hunger in the world.[3]

There is a wide range of opinions as to why this problem is so persistent. Organizations such as Food First raise the issue of food sovereignty and claim that every country on earth (with the possible minor exceptions of some city-states) has sufficient agricultural capacity to feed its own people, but that the "free trade" economic order associated with such institutions as the International Monetary Fund (IMF) and the World Bank prevent this from happening. At the other end of the spectrum, the World Bank itself claims to be part of the solution to hunger, claiming that the best way for countries to succeed in breaking the cycle of poverty and hunger is to build export-led economies that will give them the financial means to buy foodstuffs on the world market.

Amartya Sen won his 1998 Nobel Prize in part for his work demonstrating that hunger in modern times was not typically the product of a lack of food; rather, hunger usually arose from problems in food distribution networks or from governmental policies in the developing world.

Hunger in the world

Number of undernourished people (million) in 2001-2003, according to the FAO, the following countries had 5 million or more undernourished people [4]:

See also

• Copenhagen Consensus
• Malnutrition
• Famine
• Eating disorder
• United Nations World Food Programme
• Starvation
• Thirst
• Hypothalamus
• Poverty
• Satiety