What does hunger mean? What are various key definitions of hunger and how are they relatedThe questions below are based on this information, taken from World Hunger Facts. Hunger is a term which has three meanings (Oxford English Dictionary 1971)
World hunger refers to the second definition, aggregated to the world level. The related technical term (in this case operationalized in medicine) is malnutrition.1 Malnutrition is a general term that indicates a lack of some or all nutritional elements necessary for human health (Medline Plus Medical Encyclopedia). There are two basic types of malnutrition. The first and most important is protein-energy malnutrition--the lack of enough protein (from meat and other sources) and food that provides energy (measured in calories) which all of the basic food groups provide. This is the type of malnutrition that is referred to when world hunger is discussed. The second type of malnutrition, also very important, is micronutrient (vitamin and mineral) deficiency. This is not the type of malnutrition that is referred to when world hunger is discussed, though it is certainly very important. [Recently there has also been a move to include obesity as a third form of malnutrition. Considering obesity as malnutrition expands the previous usual meaning of the term which referred to poor nutrition due to lack of food inputs.2 It is poor nutrition, but it is certainly not typically due to a lack of calories, but rather too many (although poor food choices, often due to poverty, are part of the problem). Obesity will not be considered here, although obesity is certainly a health problem and is increasingly considered as a type of malnutrition.] Protein-energy malnutrition (PEM) is the most lethal form of malnutrition/hunger. It is basically a lack of calories and protein. Food is converted into energy by humans, and the energy contained in food is measured by calories. Protein is necessary for key body functions including provision of essential amino acids and development and maintenance of muscles. No one really knows how many people are malnourished. The statistic most frequently cited is that of the United Nations Food and Agriculture Organization, which measures 'undernutrition'. The most recent estimate (2006) of the FAO says that 854 million people worldwide are undernourished. This is 12.6 percent of the estimated world population of 6.6 billion. Most of the undernourished--820 million--are in developing countries. The FAO estimate is based on statistical aggregates. It looks at a country's income level and income distribution and uses this information to estimate how many people receive such a low level of income that they are malnourished. It is not an estimate based on seeing to what extent actual people are malnourished and projecting from there (as would be done by survey sampling). [It has been argued that the FAO approach is not sufficient to give accurate estimates of malnutrition (Poverty and Undernutrition p. 298 by Peter Svedberg.] Undernutrition is a relatively new concept, but is increasingly used. It should be taken as basically equivalent to malnutrition. (It should be said as an aside, that the idea of undernourishment, its relationship to malnutrition, and the reasons for its emergence as a concept is not clear to Hunger Notes.)
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