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Food security is a condition related to the supply of food, and individuals' access to it. Concerns over food security have existed throughout history. There is evidence of granaries being in use over 10,000 years ago, with central authorities in civilizations including Ancient China and Ancient Egypt being known to release food from storage in times of famine. At the 1974 World Food Conference the term "food security" was defined with an emphasis on supply. Food security, they said, is the "availability at all times of adequate world food supplies of basic foodstuffs to sustain a steady expansion of food consumption and to offset fluctuations in production and prices". Later definitions added demand and access issues to the definition. The final report of the 1996 World Food Summit states that food security "exists when all people, at all times, have physical and economic access to sufficient, safe and nutritious food to meet their dietary needs and food preferences for an active and healthy life".〔 〕〔 Household food security exists when all members, at all times, have access to enough food for an active, healthy life.〔(【引用サイトリンク】 publisher = USDA )〕 Individuals who are food secure do not live in hunger or fear of starvation. Food insecurity, on the other hand, is a situation of "limited or uncertain availability of nutritionally adequate and safe foods or limited or uncertain ability to acquire acceptable foods in socially acceptable ways", according to the United States Department of Agriculture (USDA). Food security incorporates a measure of resilience to future disruption or unavailability of critical food supply due to various risk factors including droughts, shipping disruptions, fuel shortages, economic instability, and wars. In the years 2011-2013, an estimated 842 million people were suffering from chronic hunger. The Food and Agriculture Organization of the United Nations, or FAO, identified the four pillars of food security as availability, access, utilization, and stability. The United Nations (UN) recognized the Right to food in the Declaration of Human Rights in 1948,〔 and has since noted that it is vital for the enjoyment of all other rights.〔 The 1996 World Summit on Food Security declared that "food should not be used as an instrument for political and economic pressure".〔 According to the International Centre for Trade and Sustainable Development, failed agriculture market regulation and the lack of anti-dumping mechanisms cause much of the world's food scarcity and malnutrition. ==Measurement== Food security indicators and measures are derived from country level household income and expenditure surveys to estimate per capita caloric availability. In general the objective of food security indicators and measures is to capture some or all of the main components of food security in terms of food availability, access and utilization or adequacy. While availability (production and supply) and utilization/adequacy (nutritional status/anthropometric measures) seemed much easier to estimate, thus more popular, access (ability to acquire sufficient quantity and quality) remain largely elusive. The factors influencing household food access are often context specific. Thus the financial and technical demands of collecting and analyzing data on all aspects of household's experience of food access and the development of valid and clear measures remain a huge challenge. Nevertheless, several measures have been developed that aim to capture the access component of food security, with some notable examples developed by the USAID-funded Food and Nutrition Technical Assistance (FANTA) project, collaborating with Cornell and Tufts University and Africare and World Vision.〔 These include: * ''Household Food Insecurity Access Scale'' (HFIAS) - continuous measure of the degree of food insecurity (access) in the household in the previous month * ''Household Dietary Diversity Scale'' (HDDS) - measures the number of different food groups consumed over a specific reference period (24hrs/48hrs/7days). * ''Household Hunger Scale'' (HHS)- measures the experience of household food deprivation based on a set of predictable reactions, captured through a survey and summarized in a scale. * ''Coping Strategies Index'' (CSI) - assesses household behaviours and rates them based on a set of varied established behaviours on how households cope with food shortages. The methodology for this research is base on collecting data on a single question: "What do you do when you do not have enough food, and do not have enough money to buy food?" Food insecurity is measured in the United States by questions in the Census Bureau's Current Population Survey. The questions asked are about anxiety that the household budget is inadequate to buy enough food, inadequacy in the quantity or quality of food eaten by adults and children in the household, and instances of reduced food intake or consequences of reduced food intake for adults and for children.〔USDA, Food Security Measurement. http://www.fns.usda.gov/fsec/Measurement.htm〕 A National Academy of Sciences study commissioned by the USDA criticized this measurement and the relationship of "food security" to hunger, adding "it is not clear whether hunger is appropriately identified as the extreme end of the food security scale."〔(【引用サイトリンク】title=Measuring Food Insecurity and Hunger: Phase 1 Report )〕 The FAO, World Food Programme (WFP), and International Fund for Agricultural Development (IFAD) collaborate to produce ''The State of Food Insecurity in the World''. The 2012 edition described improvements made by the FAO to the prevalence of undernourishment (PoU) indicator that is used to measure rates of food insecurity. New features include revised minimum dietary energy requirements for individual countries, updates to the world population data, and estimates of food losses in retail distribution for each country. Measurements that factor into the indicator include dietary energy supply, food production, food prices, food expenditures, and volatility of the food system. The stages of food insecurity range from food secure situations to full-scale famine. A new peer-reviewed journal of ''Food Security: The Science, Sociology and Economics of Food Production and Access to Food'' began publishing in 2009.〔(【引用サイトリンク】title=Food Security: The Science, Sociology and Economics of Food Production and Access to Food )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Food security」の詳細全文を読む スポンサード リンク
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