{"id":7575,"date":"2017-05-15T00:00:00","date_gmt":"2017-05-15T04:00:00","guid":{"rendered":"https:\/\/icesontario.wpengine.com\/news-releases\/new-research-shows-relationship-between-outdoor-air-temperature-and-likelihood-of-developing-gestational-diabetes\/"},"modified":"2023-06-14T18:15:40","modified_gmt":"2023-06-14T22:15:40","slug":"new-research-shows-relationship-between-outdoor-air-temperature-and-likelihood-of-developing-gestational-diabetes","status":"publish","type":"news_release","link":"https:\/\/www.ices.on.ca\/fr\/news-releases\/new-research-shows-relationship-between-outdoor-air-temperature-and-likelihood-of-developing-gestational-diabetes\/","title":{"rendered":"New research shows relationship between outdoor air temperature and likelihood of developing gestational diabetes"},"content":{"rendered":"<p>Women who were exposed to colder temperatures during pregnancy had a lower rate of gestational diabetes than those exposed to hotter temperatures, according to a study published online today in the <em>Canadian Medical Association Journal.<\/em><\/p>\n<p>The prevalence of gestational diabetes was 4.6 per cent among women exposed to extremely cold average temperatures (equal to or below -10 C) in the 30-day period prior to being screened for gestational diabetes, and increased to 7.7 per cent among those exposed to hot average temperatures (above 24 C). The study also found that for every 10-degree Celsius rise in temperature, women were six to nine per cent more likely to develop gestational diabetes.<\/p>\n<div>\n<div class=\"download-section alignwide infographic-download\" id=\"block_a34fe7539edcd5289a20ee5d313f8117\" data-style=\"deep-blue\">\n\t<div class=\"download-section-content\">\n\t\t\t\t<h2>\n\t\t\tInfographic\t\t<\/h2>\n\t\t\n\t\t\t<\/div>\n\t<div class=\"download-section-buttons\">\n\t\t\t\t\t\t<a class=\"download-section-buttons-primary\" href=\"https:\/\/www.ices.on.ca\/wp-content\/uploads\/2023\/03\/BoothGestationalDiabetes.jpg\" target=\"_blank\"\n\t\t\tdownload\t\t\taria-label=\"Download Infographic (opens in a new tab)\"\t\t>\n\t\t\tDownload Infographic\t\t\t<svg width=\"19\" height=\"19\" viewBox=\"0 0 19 19\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"presentation\">\n<path d=\"M2.78003 18.8301C2.14282 18.8301 1.59713 18.603 1.14297 18.1488C0.688813 17.6947 0.46212 17.1494 0.462893 16.5129V13.0372H2.78003V16.5129H16.6829V13.0372H19V16.5129C19 17.1502 18.7729 17.6958 18.3188 18.15C17.8646 18.6042 17.3193 18.8308 16.6829 18.8301H2.78003ZM9.73145 14.1958L3.9386 8.40295L5.5606 6.72303L8.57288 9.73531V0.292969H10.89V9.73531L13.9023 6.72303L15.5243 8.40295L9.73145 14.1958Z\" fill=\"#151D5D\"\/>\n<\/svg>\n\t\t<\/a>\n\t\t\n\t\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"download-section-buttons-secondary\" data-infographic-popup-open=\"block_a34fe7539edcd5289a20ee5d313f8117-infographic-popup\" aria-haspopup=\"dialog\">\n\t\t\t\tClick to View\t\t\t<\/button>\n\t\t\t\t\t\t<\/div>\n\n\t\t<div class=\"infographic-popup\" id=\"block_a34fe7539edcd5289a20ee5d313f8117-infographic-popup\" role=\"dialog\" aria-modal=\"true\" aria-label=\"Infographic\" hidden>\n\t\t<div class=\"infographic-popup-overlay\" data-infographic-popup-close><\/div>\n\t\t<div class=\"infographic-popup-container\">\n\t\t\t<button type=\"button\" class=\"infographic-popup-close\" data-infographic-popup-close aria-label=\"Close infographic\">&times;<\/button>\n\t\t\t<img decoding=\"async\" class=\"infographic-popup-image\" src=\"https:\/\/www.ices.on.ca\/wp-content\/uploads\/2023\/03\/BoothGestationalDiabetes.jpg\" alt=\"Infographic\">\n\t\t<\/div>\n\t<\/div>\n\t<\/div>\n<\/div>\n<p>The study examined 555,911 births among 396,828 women over a 12-year period. All the women studied lived in the Greater Toronto Area, but some were pregnant when the average temperature was warmer, and some when it was cooler. <\/p>\n<p>Researchers looked at the relationship between the average 30-day air temperature prior to the time of gestational diabetes screening in the second trimester, and the likelihood of gestational diabetes diagnosis. <\/p>\n<p><a href=\"\/ices-scientists\/gillian-booth\/\">Dr. Gillian Booth<\/a>, a researcher at St. Michael&#x2019;s and the <span class=\"bold\">Institute for Clinical Evaluative Sciences (ICES)<\/span> and lead author of the study, said the finding might seem counterintuitive, but can be explained by emerging science about how humans make different kinds of fat.<\/p>\n<p>&#x201c;Many would think that in warmer temperatures, women are outside and more active, which would help limit the weight gain in pregnancy that predisposes a woman to gestational diabetes,&#x201d; said Dr. Booth. &#xa0;&#x201c;However, it fits a pattern we expected from new studies showing that cold exposure can improve your sensitivity to insulin, by turning on a protective type of fat called brown adipose tissue.&#x201d;<\/p>\n<p>A similar effect was seen for each 10-degree Celsius rise in the temperature difference between two consecutive pregnancies compared within the same woman.<\/p>\n<p>&#x201c;By further limiting our analysis to pregnancies within the same woman, we controlled for a whole number of factors,&#x201d; said <a href=\"\/ices-scientists\/joel-ray\/\">Dr. Joel Ray<\/a>, a researcher at St. Michael&#x2019;s and ICES who co-led the study. &#x201c;Doing so allowed us to eliminate factors like ethnicity, income, activity and eating habits that would differ between two different women.&#x201d;<\/p>\n<p>In addition to a higher rate of gestational diabetes among women who were exposed to hotter temperatures during pregnancy, there was also a lower rate of gestational diabetes among Canadian women born in cooler climates versus those who were born in hot climates. Those women born in cooler limates, including Canada and the United States, and who were exposed to cold temperatures during the 30-day period prior to screening had a gestational diabetes rate of 3.6 per cent, while those exposed to hot temperatures had a rate of gestational diabetes of 6.3 per cent. In comparison, women who were born in hot climates, including South Asia, Africa and the Middle East, had rates of gestational diabetes of 7.7 and 11.8 per cent, respectively.<\/p>\n<p>According to Drs. Booth and Ray, the findings, combined with the continued rise in global temperatures, could signal an increase in the future number of gestational diabetes cases worldwide. <\/p>\n<p>&#x201c;While changes in temperature of this magnitude may lead to a small relative increase in the risk of gestational diabetes, the absolute number of women impacted in Canada and elsewhere may be substantial,&#x201d; they wrote.<\/p>\n<p>Gestational diabetes is new onset diabetes in the second trimester of pregnancy and is usually temporary, but the risk factors for gestational diabetes and adult onset type 2 diabetes are virtually the same.<\/p>\n<p>The results of this study could foreshadow the effects of rising world-wide temperatures on type 2 diabetes in general, according to the researchers.<\/p>\n<p>&#x201c;This is like the canary in the coal mine for the possible effects of global warming on adult onset diabetes,&#x201d; said Drs. Booth and Ray.<\/p>\n<p><strong>St. Michael&#x2019;s Hospital<\/strong> provides compassionate care to all who enter its doors. The hospital also provides outstanding medical education to future healthcare professionals in 27 academic disciplines. Critical care and trauma, heart disease, neurosurgery, diabetes, cancer care, care of the homeless and global health are among the hospital&#x2019;s recognized areas of expertise. Through the Keenan Research Centre and the Li Ka Shing International Healthcare Education Centre, which make up the Li Ka Shing Knowledge Institute, research and education at St. Michael&apos;s Hospital are recognized and make an impact around the world. Founded in 1892, the hospital is fully affiliated with the University of Toronto.<\/p>\n<p><em><span style=\"color: #002060;\"><span class=\"bold\">The Institute for Clinical Evaluative Sciences (ICES)<\/span> is an independent, non-profit organization that uses population-based health information to produce knowledge on a broad range of healthcare issues. Our unbiased evidence provides measures of health system performance, a clearer understanding of the shifting healthcare needs of Ontarians, and a stimulus for discussion of practical solutions to optimize scarce resources. ICES knowledge is highly regarded in Canada and abroad, and is widely used by government, hospitals, planners, and practitioners to make decisions about care delivery and to develop policy. For the latest ICES news, follow us on Twitter: <a href=\"http:\/\/www.twitter.com\/icesontario\" title=\"Twitter link opens in new window\" target=\"_blank\" rel=\"noopener\">@ICESOntario<\/a><\/span><\/em><\/p>\n<h2>Media contacts<\/h2>\n<p>For more information, or to arrange an interview with one of the authors, please contact:<\/p>\n<p>Kelly O&#x2019;Brien<br \/>\nCommunications Advisor &#x2013; Media<br \/>\n416-864-5047<br \/>\n<a href=\"mailto:obrienkel@smh.ca\">obrienkel@smh.ca<\/a><\/p>\n<p>Deborah Creatura<br \/>\nMedia Advisor, ICES<b><\/b><br \/>\n<a href=\"mailto:deborah.creatura@ices.on.ca\">deborah.creatura@ices.on.ca<\/a> <br \/>\n(o) 416-480-4780 or (c) 647-406-5996<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Women who were exposed to colder temperatures during pregnancy had a lower rate of gestational diabetes than those exposed to hotter temperatures, according to a study published online today in the Canadian Medical Association Journal. The prevalence of gestational diabetes was 4.6 per cent among women exposed to extremely cold average temperatures (equal to or [&hellip;]<\/p>\n","protected":false},"template":"","migration-helper-automated":[],"migration-manual":[],"topic":[53,26,21],"class_list":["post-7575","news_release","type-news_release","status-publish","hentry","topic-environmental-health","topic-maternity-and-neonatal-care","topic-women-or-gender-based-research"],"acf":{"infographic":[9394],"journal_article":[3675],"research_report":[],"atlas":[],"research_program":[6746,6740],"site":[6733],"ices_scientist":[1175,1338],"announce_or_event":[],"video":[],"iitn_type":false,"iitn_title":"'Get outside and embrace the cold:' Gestational diabetes linked to warmer temperatures","iitn_short_title":"","iitn_source_link_url":"http:\/\/www.cbc.ca\/news\/health\/gestational-diabetes-cold-1.4111558","iitn_source_link_text":"CBC","sitecore_item_id":"DC4093B9-F7C2-49A1-8E56-63DDB73538AF","sitecore_item_name":"New-research-shows-relationship-between-outdoor-air-temperature-and-likelihood","sitecore_field_values":"{\n  \"Content\": \"<p>Women who were exposed to colder temperatures during pregnancy had a lower rate of gestational diabetes than those exposed to hotter temperatures, according to a study published online today in the <em>Canadian Medical Association Journal.<\/em><\/p>rn<p>The prevalence of gestational diabetes was 4.6 per cent among women exposed to extremely cold average temperatures (equal to or below -10 C) in the 30-day period prior to being screened for gestational diabetes, and increased to 7.7 per cent among those exposed to hot average temperatures (above 24 C). The study also found that for every 10-degree Celsius rise in temperature, women were six to nine per cent more likely to develop gestational diabetes.<\/p>rn<p><a href=\"~\/media\/808E58191ADB467EAF42419D2061CAC1.ashx\" onclick=\"_gaq.push(['_trackEvent','Download', 'gestationaldiabetesInfographicMay2017',this.href]);\"><img width=\"350\" height=\"231\" alt=\"Exposure to hot temperatures during pregnancy linked to gestational diabetes risk\" src=\"~\/media\/E62502D9E81D452CA76A626E973F8B1A.ashx\" width=\"350\" height=\"231\" \/><\/a><span class=\"grey\" style=\"font-size: 12px; font-weight: bold; color: #5b5656; display: block;\">Click image to enlarge<\/span><\/p>rn<p>The study examined 555,911 births among 396,828 women over a 12-year period. All the women studied lived in the Greater Toronto Area, but some were pregnant when the average temperature was warmer, and some when it was cooler. <\/p>rn<p>Researchers looked at the relationship between the average 30-day air temperature prior to the time of gestational diabetes screening in the second trimester, and the likelihood of gestational diabetes diagnosis. <\/p>rn<p><a href=\"~\/link.aspx?_id=98B8617FC6B940329C0D7053D3651ABA&amp;_z=z\">Dr. Gillian Booth<\/a>, a researcher at St. Michael&rsquo;s and the <span class=\"bold\">Institute for Clinical Evaluative Sciences (ICES)<\/span> and lead author of the study, said the finding might seem counterintuitive, but can be explained by emerging science about how humans make different kinds of fat.<\/p>rn<p>&ldquo;Many would think that in warmer temperatures, women are outside and more active, which would help limit the weight gain in pregnancy that predisposes a woman to gestational diabetes,&rdquo; said Dr. Booth. &nbsp;&ldquo;However, it fits a pattern we expected from new studies showing that cold exposure can improve your sensitivity to insulin, by turning on a protective type of fat called brown adipose tissue.&rdquo;<\/p>rn<p>A similar effect was seen for each 10-degree Celsius rise in the temperature difference between two consecutive pregnancies compared within the same woman.<\/p>rn<p>&ldquo;By further limiting our analysis to pregnancies within the same woman, we controlled for a whole number of factors,&rdquo; said <a href=\"~\/link.aspx?_id=7044C4BC350144A28F5BDB6E2ACD12A6&amp;_z=z\">Dr. Joel Ray<\/a>, a researcher at St. Michael&rsquo;s and ICES who co-led the study. &ldquo;Doing so allowed us to eliminate factors like ethnicity, income, activity and eating habits that would differ between two different women.&rdquo;<\/p>rn<p>In addition to a higher rate of gestational diabetes among women who were exposed to hotter temperatures during pregnancy, there was also a lower rate of gestational diabetes among Canadian women born in cooler climates versus those who were born in hot climates. Those women born in cooler limates, including Canada and the United States, and who were exposed to cold temperatures during the 30-day period prior to screening had a gestational diabetes rate of 3.6 per cent, while those exposed to hot temperatures had a rate of gestational diabetes of 6.3 per cent. In comparison, women who were born in hot climates, including South Asia, Africa and the Middle East, had rates of gestational diabetes of 7.7 and 11.8 per cent, respectively.<\/p>rn<p>According to Drs. Booth and Ray, the findings, combined with the continued rise in global temperatures, could signal an increase in the future number of gestational diabetes cases worldwide. <\/p>rn<p>&ldquo;While changes in temperature of this magnitude may lead to a small relative increase in the risk of gestational diabetes, the absolute number of women impacted in Canada and elsewhere may be substantial,&rdquo; they wrote.<\/p>rn<p>Gestational diabetes is new onset diabetes in the second trimester of pregnancy and is usually temporary, but the risk factors for gestational diabetes and adult onset type 2 diabetes are virtually the same.<\/p>rn<p>The results of this study could foreshadow the effects of rising world-wide temperatures on type 2 diabetes in general, according to the researchers.<\/p>rn<p>&ldquo;This is like the canary in the coal mine for the possible effects of global warming on adult onset diabetes,&rdquo; said Drs. Booth and Ray.<\/p>rn<p><strong>St. Michael&rsquo;s Hospital<\/strong> provides compassionate care to all who enter its doors. The hospital also provides outstanding medical education to future healthcare professionals in 27 academic disciplines. Critical care and trauma, heart disease, neurosurgery, diabetes, cancer care, care of the homeless and global health are among the hospital&rsquo;s recognized areas of expertise. Through the Keenan Research Centre and the Li Ka Shing International Healthcare Education Centre, which make up the Li Ka Shing Knowledge Institute, research and education at St. Michael's Hospital are recognized and make an impact around the world. Founded in 1892, the hospital is fully affiliated with the University of Toronto.<\/p>rn<p><em><span style=\"color: #002060;\"><span class=\"bold\">The Institute for Clinical Evaluative Sciences (ICES)<\/span> is an independent, non-profit organization that uses population-based health information to produce knowledge on a broad range of healthcare issues. Our unbiased evidence provides measures of health system performance, a clearer understanding of the shifting healthcare needs of Ontarians, and a stimulus for discussion of practical solutions to optimize scarce resources. ICES knowledge is highly regarded in Canada and abroad, and is widely used by government, hospitals, planners, and practitioners to make decisions about care delivery and to develop policy. For the latest ICES news, follow us on Twitter: <a href=\"http:\/\/www.twitter.com\/icesontario\" title=\"Twitter link opens in new window\" target=\"_blank\">@ICESOntario<\/a><\/span><\/em><\/p>rn<h2>Media contacts<\/h2>rn<p>For more information, or to arrange an interview with one of the authors, please contact:<\/p>rn<p>Kelly O&rsquo;Brien<br \/>rnCommunications Advisor &ndash; Media<br \/>rn416-864-5047<br \/>rn<a href=\"mailto:obrienkel@smh.ca\">obrienkel@smh.ca<\/a><\/p>rn<p>Deborah Creatura<br \/>rnMedia Advisor, ICES<b><\/b><br \/>rn<a href=\"mailto:deborah.creatura@ices.on.ca\">deborah.creatura@ices.on.ca<\/a> <br \/>rn(o) 416-480-4780 or (c) 647-406-5996<\/p>\",\n  \"Title\": \"New research shows relationship between outdoor air temperature and likelihood of developing gestational diabetes\",\n  \"Short title\": \"New research shows relationship between\",\n  \"Teaser image\": \"<image mediaid=\"{A322F4BD-074D-4BD9-A21A-A9A358DE2CFF}\" mediapath=\"\/Images\/ovoid-shape\/ovoid-2\" src=\"~\/media\/A322F4BD074D4BD9A21AA9A358DE2CFF.ashx\" alt=\"&quot;&quot;\" height=\"\" width=\"\" hspace=\"\" vspace=\"\" \/>\",\n  \"Summary\": \"Women who were exposed to colder temperatures during pregnancy had a lower rate of gestational diabetes than those exposed to hotter temperatures.\",\n  \"Location\": \"Toronto\",\n  \"In The News\": \"{2659AD41-8726-41A6-AFD2-07D0CB8DF5E9}\",\n  \"ICES Scientists\": \"{98B8617F-C6B9-4032-9C0D-7053D3651ABA}|{7044C4BC-3501-44A2-8F5B-DB6E2ACD12A6}\",\n  \"ICES Locations\": \"{4FCAABBA-14A5-42E6-8F33-BC6C2F1D9908}\",\n  \"Research Programs\": \"{CFE36C89-C969-4C23-B5E4-1BA9E5BDC273}|{46DF28D2-EDE8-4DF2-8CC0-87CEF464E435}\",\n  \"Posted Date\": \"20170515T000000\",\n  \"Publication Link\": \"<link text=\"Abstract\" linktype=\"internal\" url=\"\/ICES\/Home\/Publications\/Journal-Articles\/2017\/May\/Influence-of-environmental-temperature-on-gestational-diabetes-risk\" querystring=\"\" target=\"\" id=\"{59FFD93B-9AAA-4998-B4C0-0959B30A5DB2}\" \/>\",\n  \"Related Link\": \"<link text=\"ICES in the News | CBC\" linktype=\"external\" url=\"http:\/\/www.cbc.ca\/news\/health\/gestational-diabetes-cold-1.4111558\" anchor=\"\" title=\"opens external link\" target=\"\" \/>\"\n}","previous_url":"https:\/\/www.ices.on.ca\/Newsroom\/News-Releases\/2017\/New-research-shows-relationship-between-outdoor-air-temperature-and-likelihood"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ICES | New research shows relationship between outdoor air temperature and likelihood of developing gestational diabetes<\/title>\n<meta name=\"description\" content=\"Women who were exposed to colder temperatures during pregnancy had a lower rate of gestational diabetes than those exposed to hotter temperatures,\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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