{"id":129,"date":"2016-03-20T13:13:49","date_gmt":"2016-03-20T18:13:49","guid":{"rendered":"https:\/\/annasilvertand.com\/?p=129"},"modified":"2021-07-06T21:27:05","modified_gmt":"2021-07-07T02:27:05","slug":"what-is-a-calorie","status":"publish","type":"post","link":"https:\/\/annasilvertand.com\/what-is-a-calorie\/","title":{"rendered":"What is a Calorie?"},"content":{"rendered":"<p style=\"text-align: justify;\">We\u00a0hear calorie; we\u00a0think food. But is that justified? Are calories only used to indicate how much energy can be accredited to a certain food product or are calories also useful in other ways? And maybe a question that is even more important, what exactly is a calorie?<!--more--><\/p>\n<h3 style=\"text-align: justify;\">Energy<\/h3>\n<p style=\"text-align: justify;\">Definition: A calorie is the amount of energy that we need\u00a0to raise the temperature of one gram of water by one degree Celsius, at a pressure of one atmosphere.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_1');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_1');\" ><sup id=\"footnote_plugin_tooltip_129_1_1\" class=\"footnote_plugin_tooltip_text\">[1]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_1\" class=\"footnote_tooltip\"><span id=\"js-reference-string-1\" class=\"selectable\">Ebbing, D. and Gammon, S. (2011). General chemistry. Australia: Brooks\/Cole Cengage Learning.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_1').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_1', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script><\/span><\/p>\n<p style=\"text-align: justify;\">All these units we use to measure a\u00a0calorie can seem pretty dry. So imagine boiling water to make some tea. You are\u00a0standing in your\u00a0kitchen so we can assume that the pressure you are working with is one atmosphere. Underneath your kettle, you have a heat source that will slowly raise the temperature of the water you are trying to heat up.<\/p>\n<figure style=\"width: 640px\" class=\"wp-caption aligncenter\"><a title=\"Wood Stove\" href=\"https:\/\/www.flickr.com\/photos\/felipevalduga\/19419636234\/in\/photolist-nVv2Jg-vA3Swq-vA3Hho\" target=\"_blank\" data-flickr-embed=\"true\" rel=\"noopener\"><img loading=\"lazy\" src=\"https:\/\/c3.staticflickr.com\/4\/3816\/19419636234_b29d7926f5_z.jpg\" alt=\"Wood Stove\" width=\"640\" height=\"506\" \/><\/a><figcaption class=\"wp-caption-text\">\u00a9 Felipe Valduga<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_2');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_2');\" ><sup id=\"footnote_plugin_tooltip_129_1_2\" class=\"footnote_plugin_tooltip_text\">[2]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_2\" class=\"footnote_tooltip\">This work is copyrighted by the mentioned creator. The license under which this work may be used can be found at <span class=\"footnote_url_wrap\">http:\/\/creativecommons.org\/licenses\/by\/4.0\/.<\/span> For more information on the creator and media, please visit: <span class=\"footnote_url_wrap\">https:\/\/www.flickr.com\/photos\/felipevalduga\/<\/span><\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_2').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_2', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script><\/figcaption><\/figure>\n<p style=\"text-align: justify;\">The heat\u00a0is a type of energy (thermal energy) that can be transferred to\u00a0the kettle. The fire is much warmer\u00a0than the kettle is but the part of the kettle closest to the heat source, will warm up by absorbing energy from the fire. \u00a0As you know from putting a kettle\u00a0of water on the stove and turning it on, after a while both your kettle and the water in it will get warm. The energy that is being transferred from the heat source to the kettle is changing the temperature of the water.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_3');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_3');\" ><sup id=\"footnote_plugin_tooltip_129_1_3\" class=\"footnote_plugin_tooltip_text\">[3]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_3\" class=\"footnote_tooltip\"><span id=\"js-reference-string-3\" class=\"selectable\">Schobert, H. (2013). Energy. Routledge.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_3').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_3', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script> <\/span><\/p>\n<h3 style=\"text-align: justify;\"><span id=\"js-reference-string-3\" class=\"selectable\">Units<\/span><\/h3>\n<p style=\"text-align: justify;\"><span id=\"js-reference-string-3\" class=\"selectable\">Using a calorie to express a measure of energy can be useful at times. Many chemists, nutritionist, food scientists and now and then physicists will have to use a calorie to take a closer look at what is going on on\u00a0an energy level while getting\u00a0to the bottom of a problem. Before it is useful, however, knowing you can express a calorie in joule is important. One calorie is equal to about 1.184 joules, and 1 joule can be expressed as N\u0387m or m<sup>2<\/sup>\u0387kg\u0387s<sup>-2\u00a0<\/sup><\/span><span id=\"js-reference-string-3\" class=\"selectable\"><span id=\"js-reference-string-5\" class=\"selectable\">. \u00a0Most\u00a0often the calorie will not be used for calculations unrelated to food, and instead, the joule is used.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_4');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_4');\" ><sup id=\"footnote_plugin_tooltip_129_1_4\" class=\"footnote_plugin_tooltip_text\">[4]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_4\" class=\"footnote_tooltip\"><span id=\"js-reference-string-5\" class=\"selectable\">Thompson, A. and Taylor, B. (2008). Guide for the use of the International System of Units (SI). Gaithersburg, M.D.: National Institute of Standards and Technology.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_4').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_4', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script>\u00a0<\/span><\/span><\/span><\/p>\n<h3 style=\"text-align: justify;\">Calories<\/h3>\n<p style=\"text-align: justify;\">Using calories to express the amount of energy you are talking about does not change what\u00a0you\u00a0are talking about. You can tell someone how much you weight in for instance kilograms but also in pounds, and it will not change your weight. You can also\u00a0tell them how tall you are in centimetres instead of in inches, and you will\u00a0not suddenly be taller by doing so. You just change the way of expressing\u00a0how much you weigh\u00a0or how tall you are.<\/p>\n<p><a title=\"Measuring Tape\" href=\"https:\/\/www.flickr.com\/photos\/140361021@N04\/27507470782\/in\/dateposted-public\/\" target=\"_blank\" embed=\"true\" rel=\"noopener\" class=\"broken_link\"><img loading=\"lazy\" class=\"aligncenter\" src=\"https:\/\/c7.staticflickr.com\/8\/7663\/27507470782_bd4a78a878_z.jpg\" alt=\"Measuring Tape\" width=\"640\" height=\"427\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">When eating food, we supply our bodies with energy. The amount of energy we get from food is expressed in calories.\u00a0If we eat a lot and\u00a0take in more energy than we use, our bodies will store that energy in the shape of fat. And when we need\u00a0to stay\u00a0warm, move or do other things, we use the directly available energy from food or the energy we have stored.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_5');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_5');\" ><sup id=\"footnote_plugin_tooltip_129_1_5\" class=\"footnote_plugin_tooltip_text\">[5]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_5\" class=\"footnote_tooltip\"><span id=\"js-reference-string-0\" class=\"selectable\">McCall, Richard Powell. Physics Of The Human Body. Baltimore, Md.: Johns Hopkins University Press, 2010. Print.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_5').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_5', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script><span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_6');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_6');\" ><sup id=\"footnote_plugin_tooltip_129_1_6\" class=\"footnote_plugin_tooltip_text\">[6]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_6\" class=\"footnote_tooltip\"><span id=\"js-reference-string-0\" class=\"selectable\">Haugen, David M, and Susan Musser. Nutrition. Detroit: Greenhaven Press\/Gale Cengage Learning, 2012. Print.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_6').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_6', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script><\/span><\/span><\/p>\n<h3 style=\"text-align: justify;\">Calorie (cal) or KiloCalorie (kcal)?<\/h3>\n<p style=\"text-align: justify;\">A calorie is often used interchangeably with a kilocalorie. There is a difference between a calorie (cal) and a kilocalorie (kcal) however.\u00a0A kilocalorie (like the name suggests) is\u00a0the amount of energy that is needed to raise the temperature of one KILOgram\u00a0of water by one degree at a pressure of one atmosphere. This means that in one kcal, you can find 1000 regular calories.<\/p>\n<p style=\"text-align: justify;\">When we talk about food and calories, you often read amounts like; 230 calories per serving. And this is where it gets confusing. When we talk about food, we say 230 calories, when we are talking about kilocalories. We need more than 230 single\u00a0calories per serving! So when defining the calories on food labels or in your food, realise that you are dealing with a unit that describes the amount of energy that is needed to raise the temperature of one KILOgram\u00a0of water by one degree under standard circumstances.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_7');\" onkeypress=\"footnote_moveToReference_129_1('footnote_plugin_reference_129_1_7');\" ><sup id=\"footnote_plugin_tooltip_129_1_7\" class=\"footnote_plugin_tooltip_text\">[7]<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_129_1_7\" class=\"footnote_tooltip\"><span id=\"js-reference-string-0\" class=\"selectable\">Haugen, David M, and Susan Musser. Nutrition. Detroit: Greenhaven Press\/Gale Cengage Learning, 2012. Print.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_129_1_7').tooltip({ tip: '#footnote_plugin_tooltip_text_129_1_7', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script><\/span><\/p>\n<div class=\"speaker-mute footnotes_reference_container\"> <div class=\"footnote_container_prepare\"><p><span role=\"button\" tabindex=\"0\" class=\"footnote_reference_container_label pointer\" onclick=\"footnote_expand_collapse_reference_container_129_1();\">References<\/span><span role=\"button\" tabindex=\"0\" class=\"footnote_reference_container_collapse_button\" style=\"\" onclick=\"footnote_expand_collapse_reference_container_129_1();\">[<a id=\"footnote_reference_container_collapse_button_129_1\">+<\/a>]<\/span><\/p><\/div> <div id=\"footnote_references_container_129_1\" style=\"display: none;\"><table class=\"footnotes_table footnote-reference-container\"><caption class=\"accessibility\">References<\/caption> <tbody> \r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_1');\"><a id=\"footnote_plugin_reference_129_1_1\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>1<\/a><\/th> <td class=\"footnote_plugin_text\"><span id=\"js-reference-string-1\" class=\"selectable\">Ebbing, D. and Gammon, S. (2011). General chemistry. Australia: Brooks\/Cole Cengage Learning.<\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_2');\"><a id=\"footnote_plugin_reference_129_1_2\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>2<\/a><\/th> <td class=\"footnote_plugin_text\">This work is copyrighted by the mentioned creator. The license under which this work may be used can be found at <span class=\"footnote_url_wrap\">http:\/\/creativecommons.org\/licenses\/by\/4.0\/.<\/span> For more information on the creator and media, please visit: <span class=\"footnote_url_wrap\">https:\/\/www.flickr.com\/photos\/felipevalduga\/<\/span><\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_3');\"><a id=\"footnote_plugin_reference_129_1_3\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>3<\/a><\/th> <td class=\"footnote_plugin_text\"><span id=\"js-reference-string-3\" class=\"selectable\">Schobert, H. (2013). Energy. Routledge.<\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_4');\"><a id=\"footnote_plugin_reference_129_1_4\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>4<\/a><\/th> <td class=\"footnote_plugin_text\"><span id=\"js-reference-string-5\" class=\"selectable\">Thompson, A. and Taylor, B. (2008). Guide for the use of the International System of Units (SI). Gaithersburg, M.D.: National Institute of Standards and Technology.<\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_5');\"><a id=\"footnote_plugin_reference_129_1_5\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>5<\/a><\/th> <td class=\"footnote_plugin_text\"><span id=\"js-reference-string-0\" class=\"selectable\">McCall, Richard Powell. Physics Of The Human Body. Baltimore, Md.: Johns Hopkins University Press, 2010. Print.<\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi\" ><a id=\"footnote_plugin_reference_129_1_6\" class=\"footnote_backlink\" onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_6');\"><span class=\"footnote_index_arrow\">&#8593;<\/span>6,<\/a> <a id=\"footnote_plugin_reference_129_1_7\" class=\"footnote_backlink\" onclick=\"footnote_moveToAnchor_129_1('footnote_plugin_tooltip_129_1_7');\"><span class=\"footnote_index_arrow\">&#8593;<\/span>7<\/a><\/th> <td class=\"footnote_plugin_text\"><span id=\"js-reference-string-0\" class=\"selectable\">Haugen, David M, and Susan Musser. Nutrition. Detroit: Greenhaven Press\/Gale Cengage Learning, 2012. Print.<\/td><\/tr>\r\n\r\n <\/tbody> <\/table> <\/div><\/div><script type=\"text\/javascript\"> function footnote_expand_reference_container_129_1() { jQuery('#footnote_references_container_129_1').show(); jQuery('#footnote_reference_container_collapse_button_129_1').text('\u2212'); } function footnote_collapse_reference_container_129_1() { jQuery('#footnote_references_container_129_1').hide(); jQuery('#footnote_reference_container_collapse_button_129_1').text('+'); } function footnote_expand_collapse_reference_container_129_1() { if (jQuery('#footnote_references_container_129_1').is(':hidden')) { footnote_expand_reference_container_129_1(); } else { footnote_collapse_reference_container_129_1(); } } function footnote_moveToReference_129_1(p_str_TargetID) { footnote_expand_reference_container_129_1(); var l_obj_Target = jQuery('#' + p_str_TargetID); if (l_obj_Target.length) { jQuery( 'html, body' ).delay( 0 ); jQuery('html, body').animate({ scrollTop: l_obj_Target.offset().top - window.innerHeight * 0.2 }, 380); } } function footnote_moveToAnchor_129_1(p_str_TargetID) { footnote_expand_reference_container_129_1(); var l_obj_Target = jQuery('#' + p_str_TargetID); if (l_obj_Target.length) { jQuery( 'html, body' ).delay( 0 ); jQuery('html, body').animate({ scrollTop: l_obj_Target.offset().top - window.innerHeight * 0.2 }, 380); } }<\/script>","protected":false},"excerpt":{"rendered":"<p>We\u00a0hear calorie; we\u00a0think food. But is that justified? Are calories only used to indicate how much energy can be accredited to a certain food product or are calories also useful in other ways? And maybe a question that is even more important, what exactly is a calorie?<\/p>\n","protected":false},"author":2,"featured_media":281,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":""},"categories":[27],"tags":[28,15],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is a Calorie? - Anna Silvertand<\/title>\n<meta name=\"description\" content=\"We\u00a0hear calorie, we\u00a0think food. But is that justified? What exactly is a calorie?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/annasilvertand.com\/what-is-a-calorie\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is a Calorie? - Anna Silvertand\" \/>\n<meta property=\"og:description\" content=\"We\u00a0hear calorie, we\u00a0think food. But is that justified? 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