Hunger

Hunger is applied literally to the need or craving for food; it can also be applied metaphorically to cravings of other sorts. It is an extreme of a normal appetite.

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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).

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The term hungry is commonly used simply to mean having an appetite 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 a progressively more severe sensation, until it becomes acutely painful. Prolonged hunger will drive people to eat substances with no nutritional value, such as grass and soil, simply to fill their stomachs (which has an adverse effect on energy balance as energy is still required to digest these substances). Lack of particular nutrients leads to particular medical types of malnutrition. Kwashiorkor and marasmus are prime examples. Eventually, after protracted malnourishment, death will occur through starvation.

Food: Food is any substance consumed by living organisms, including liquid drinks. Food is the main source of energy and of nutrition for animals, and is usually of animal or plant origin....

Appetite: The appetite is the desire to eat food, felt as hunger. Appetite exists in all higher lifeforms, and serves to regulate adequate energy intake to maintain metabolic needs. It is regulated by a close interplay between the digestive tract, adipose tissue and the brain. Decreased desire to eat is terme...

Malnutrition: Malnutrition is a general term for the medical condition in a person or animal caused by an unbalanced diet—either too little or too much food, or a diet missing one or more important nutrients....

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