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48302 What is undernourishment and how is it measured? undernourishment-definition post publish <!-- wp:columns {"className":"is-style-side-by-side"} --> <div class="wp-block-columns is-style-side-by-side"><!-- wp:column --> <div class="wp-block-column"><!-- wp:paragraph --> <p>‘Undernourishment’ is the main indicator used by the <a href="https://www.fao.org/faostat/en/#data/FS">Food and Agriculture Organization of the United Nations</a> to measure the extent of food supplies and nutrition. It is often used interchangeably with the term ‘hunger’.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Undernourishment is solely determined by the sufficiency of <strong>energy (calorie) intake</strong>. It does not consider the quality or diversity of someone’s diet. That means it is only one component of malnutrition: a broader term that also captures other types of nutrient deficiencies, such as micronutrients.&nbsp;</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The prevalence of undernourishment in any given country or region measures the share of the population that has a daily food intake that is insufficient to provide, on average, the amount of dietary energy required to maintain a normal, active and healthy life. That is, the share of people who do not get enough calories to live a healthy life.</p> <!-- /wp:paragraph --> <!-- wp:html --> <iframe src="https://ourworldindata.org/grapher/prevalence-of-undernourishment" loading="lazy" style="width: 100%; height: 600px; border: 0px none;"></iframe> <!-- /wp:html --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:heading {"level":4} --> <h4>How is undernourishment measured?</h4> <!-- /wp:heading --> <!-- wp:paragraph --> <p>To judge whether someone was undernourished we would need to know two things:</p> <!-- /wp:paragraph --> <!-- wp:list {"ordered":true} --> <ol><li>How many calories they consume;</li><li>How many calories they need to maintain a healthy life.</li></ol> <!-- /wp:list --> <!-- wp:paragraph --> <p>This might be easy for a known individual, but measuring this across a whole population is more difficult.&nbsp;</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The amount of calories that people <em>need</em> can be very different: factors such as someone’s height, weight, sex, age, and activity levels will mean that some people need more calories than others.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>The amount of calories that people <em>consume</em> also varies widely – some people eat more than their requirements – which can lead to <a href="http://ourworldindata.org/obesity">obesity</a> – while others eat well below their requirements.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>This means we cannot simply calculate undernourishment from an average of calorie consumption and requirements.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>To take account of this, the UN FAO address inequalities using three factors: {ref}FAO, IFAD, UNICEF, WFP and WHO. 2021. <a href="https://www.fao.org/3/cb4474en/cb4474en.pdf">The State of Food Security and Nutrition in the World 2021. Transforming food systems for food security, improved nutrition and affordable healthy diets for all</a>. Rome, FAO.{/ref}:</p> <!-- /wp:paragraph --> <!-- wp:list {"ordered":true} --> <ol><li>They estimate the <strong>average availability of calories (energy)</strong> across the population.<br></li><li>They measure the levels of inequalities in food consumption within a population. This is called the <strong>Coefficient of Variation (CV) of energy intake</strong>. This metric is shown in the map. As we see, this value varies from country to country depending on the inequalities in food supply.<br></li><li>They use demographic information – such as age structure, sex, height, and activity levels – for each country to assess the distribution of energy requirements. This means the ‘<strong>minimum energy requirement</strong>’ for each country is slightly different, as shown on the map.</li></ol> <!-- /wp:list --> <!-- wp:paragraph --> <p>Using these three factors, they then calculate undernourishment using a ‘parametric probability density function’. This indicates the cumulative probability across a population that someone has a daily energy intake that is lower than the minimum requirements.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>This undernourishment measure, therefore, does not tell us anything about what specific individuals are undernourished. But it gives us an estimate of what share of a population does not get enough calories to eat.</p> <!-- /wp:paragraph --> <!-- wp:columns {"className":"is-style-side-by-side"} --> <div class="wp-block-columns is-style-side-by-side"><!-- wp:column --> <div class="wp-block-column"><!-- wp:html --> <iframe src="https://ourworldindata.org/grapher/coefficient-of-variation-cv-in-per-capita-caloric-intake" loading="lazy" style="width: 100%; height: 600px; border: 0px none;"></iframe> <!-- /wp:html --></div> <!-- /wp:column --> <!-- wp:column --> <div class="wp-block-column"><!-- wp:html --> <iframe src="https://ourworldindata.org/grapher/minimum-requirement-calories" loading="lazy" style="width: 100%; height: 600px; border: 0px none;"></iframe> <!-- /wp:html --> <!-- wp:paragraph --> <p></p> <!-- /wp:paragraph --></div> <!-- /wp:column --></div> <!-- /wp:columns --> <!-- wp:heading {"level":5} --> <h5>Keep reading at <em>Our World in Data</em></h5> <!-- /wp:heading --> <!-- wp:owid/prominent-link {"title":"","linkUrl":"https://ourworldindata.org/hunger-and-undernourishment","className":"is-style-thin"} /--> 
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 2022-02-04 10:09:29 2024-03-03 19:54:32 1U9ZKwPhTSfss5-2XlReGZ6ivGHP0sqD5-6G4wJScElM 
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 How do we measure the prevalence of hunger across the world? 2022-02-04 10:05:48 2023-05-15 16:48:23 https://ourworldindata.org/wp-content/uploads/2022/02/Undernourishment-definition-01.png 
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 ‘Undernourishment’ is the main indicator used by the [Food and Agriculture Organization of the United Nations](https://www.fao.org/faostat/en/#data/FS) to measure the extent of food supplies and nutrition. It is often used interchangeably with the term ‘hunger’. Undernourishment is solely determined by the sufficiency of **energy (calorie) intake**. It does not consider the quality or diversity of someone’s diet. That means it is only one component of malnutrition: a broader term that also captures other types of nutrient deficiencies, such as micronutrients.  The prevalence of undernourishment in any given country or region measures the share of the population that has a daily food intake that is insufficient to provide, on average, the amount of dietary energy required to maintain a normal, active and healthy life. That is, the share of people who do not get enough calories to live a healthy life. <Chart url="https://ourworldindata.org/grapher/prevalence-of-undernourishment"/> ## How is undernourishment measured? To judge whether someone was undernourished we would need to know two things: 0. How many calories they consume; 1. How many calories they need to maintain a healthy life. This might be easy for a known individual, but measuring this across a whole population is more difficult.  The amount of calories that people _need_ can be very different: factors such as someone’s height, weight, sex, age, and activity levels will mean that some people need more calories than others. The amount of calories that people _consume_ also varies widely – some people eat more than their requirements – which can lead to [obesity](http://ourworldindata.org/obesity) – while others eat well below their requirements. This means we cannot simply calculate undernourishment from an average of calorie consumption and requirements. To take account of this, the UN FAO address inequalities using three factors: {ref}FAO, IFAD, UNICEF, WFP and WHO. 2021. [The State of Food Security and Nutrition in the World 2021. Transforming food systems for food security, improved nutrition and affordable healthy diets for all](https://www.fao.org/3/cb4474en/cb4474en.pdf). Rome, FAO.{/ref}: 0. They estimate the **average availability of calories (energy)** across the population. 1. They measure the levels of inequalities in food consumption within a population. This is called the **Coefficient of Variation (CV) of energy intake**. This metric is shown in the map. As we see, this value varies from country to country depending on the inequalities in food supply. 2. They use demographic information – such as age structure, sex, height, and activity levels – for each country to assess the distribution of energy requirements. This means the ‘**minimum energy requirement**’ for each country is slightly different, as shown on the map. Using these three factors, they then calculate undernourishment using a ‘parametric probability density function’. This indicates the cumulative probability across a population that someone has a daily energy intake that is lower than the minimum requirements. This undernourishment measure, therefore, does not tell us anything about what specific individuals are undernourished. But it gives us an estimate of what share of a population does not get enough calories to eat. <Chart url="https://ourworldindata.org/grapher/coefficient-of-variation-cv-in-per-capita-caloric-intake"/> <Chart url="https://ourworldindata.org/grapher/minimum-requirement-calories"/> ### Keep reading at _Our World in Data_ ### https://ourworldindata.org/hunger-and-undernourishment 
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        "rendered": "\n<div class=\"wp-block-columns is-style-side-by-side\">\n<div class=\"wp-block-column\">\n<p>\u2018Undernourishment\u2019 is the main indicator used by the <a href=\"https://www.fao.org/faostat/en/#data/FS\">Food and Agriculture Organization of the United Nations</a> to measure the extent of food supplies and nutrition. It is often used interchangeably with the term \u2018hunger\u2019.</p>\n\n\n\n<p>Undernourishment is solely determined by the sufficiency of <strong>energy (calorie) intake</strong>. It does not consider the quality or diversity of someone\u2019s diet. That means it is only one component of malnutrition: a broader term that also captures other types of nutrient deficiencies, such as micronutrients.&nbsp;</p>\n\n\n\n<p>The prevalence of undernourishment in any given country or region measures the share of the population that has a daily food intake that is insufficient to provide, on average, the amount of dietary energy required to maintain a normal, active and healthy life. That is, the share of people who do not get enough calories to live a healthy life.</p>\n\n\n\n<iframe src=\"https://ourworldindata.org/grapher/prevalence-of-undernourishment\" loading=\"lazy\" style=\"width: 100%; height: 600px; border: 0px none;\"></iframe>\n</div>\n\n\n\n<div class=\"wp-block-column\"></div>\n</div>\n\n\n\n<h4>How is undernourishment measured?</h4>\n\n\n\n<p>To judge whether someone was undernourished we would need to know two things:</p>\n\n\n\n<ol><li>How many calories they consume;</li><li>How many calories they need to maintain a healthy life.</li></ol>\n\n\n\n<p>This might be easy for a known individual, but measuring this across a whole population is more difficult.&nbsp;</p>\n\n\n\n<p>The amount of calories that people <em>need</em> can be very different: factors such as someone\u2019s height, weight, sex, age, and activity levels will mean that some people need more calories than others.</p>\n\n\n\n<p>The amount of calories that people <em>consume</em> also varies widely \u2013 some people eat more than their requirements \u2013 which can lead to <a href=\"http://ourworldindata.org/obesity\">obesity</a> \u2013 while others eat well below their requirements.</p>\n\n\n\n<p>This means we cannot simply calculate undernourishment from an average of calorie consumption and requirements.</p>\n\n\n\n<p>To take account of this, the UN FAO address inequalities using three factors: {ref}FAO, IFAD, UNICEF, WFP and WHO. 2021. <a href=\"https://www.fao.org/3/cb4474en/cb4474en.pdf\">The State of Food Security and Nutrition in the World 2021. Transforming food systems for food security, improved nutrition and affordable healthy diets for all</a>. Rome, FAO.{/ref}:</p>\n\n\n\n<ol><li>They estimate the <strong>average availability of calories (energy)</strong> across the population.<br></li><li>They measure the levels of inequalities in food consumption within a population. This is called the <strong>Coefficient of Variation (CV) of energy intake</strong>. This metric is shown in the map. As we see, this value varies from country to country depending on the inequalities in food supply.<br></li><li>They use demographic information \u2013 such as age structure, sex, height, and activity levels \u2013 for each country to assess the distribution of energy requirements. This means the \u2018<strong>minimum energy requirement</strong>\u2019 for each country is slightly different, as shown on the map.</li></ol>\n\n\n\n<p>Using these three factors, they then calculate undernourishment using a \u2018parametric probability density function\u2019. This indicates the cumulative probability across a population that someone has a daily energy intake that is lower than the minimum requirements.</p>\n\n\n\n<p>This undernourishment measure, therefore, does not tell us anything about what specific individuals are undernourished. But it gives us an estimate of what share of a population does not get enough calories to eat.</p>\n\n\n\n<div class=\"wp-block-columns is-style-side-by-side\">\n<div class=\"wp-block-column\">\n<iframe src=\"https://ourworldindata.org/grapher/coefficient-of-variation-cv-in-per-capita-caloric-intake\" loading=\"lazy\" style=\"width: 100%; height: 600px; border: 0px none;\"></iframe>\n</div>\n\n\n\n<div class=\"wp-block-column\">\n<iframe src=\"https://ourworldindata.org/grapher/minimum-requirement-calories\" loading=\"lazy\" style=\"width: 100%; height: 600px; border: 0px none;\"></iframe>\n\n\n\n<p></p>\n</div>\n</div>\n\n\n\n<h5>Keep reading at <em>Our World in Data</em></h5>\n\n\n    <block type=\"prominent-link\" style=\"is-style-thin\">\n        <link-url>https://ourworldindata.org/hunger-and-undernourishment</link-url>\n        <title></title>\n        <content></content>\n        <figure></figure>\n    </block>",
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    "excerpt": {
        "rendered": "How do we measure the prevalence of hunger across the world?",
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    },
    "date_gmt": "2022-02-04T10:09:29",
    "modified": "2023-05-15T17:48:23",
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    "ping_status": "closed",
    "authors_name": [
        "Hannah Ritchie"
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    "modified_gmt": "2023-05-15T16:48:23",
    "comment_status": "closed",
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