New BMI Thresholds Suggested for Black Britons and other UK Ethnic Minorities

January 13, 2024
3 mins read

By Newsdesk Tuesday, August 5, 2015. Health researchers have suggested new body mass index (BMI) thresholds for defining overweight and obese individuals in ethnic communities.  Being overweight or obese increases the risk diabetes. Presently, a BMI of 30kg/m2 or above is defined as obese but Black Britons, South Asians and Anglo-Chinese populations have an equivalent risk of diabetes at lower BMIs than White people.  The National Institute of Clinical Excellence has previously issued guidance on the subject to health professionals but recommended that further studies be undertaken to define the thresholds for ethnic minorities.  In an attempt to define new thresholds, researchers from the University of Glasgow analysed data on 490,288 people who participated in UK Biobank.  They found that the rate of diabetes observed among Whites classified as obese with a BMI of at least 30, was matched by South Asians with a BMI of at least 22, Chinese with a BMI at least 24 and Black people with a BMI at least 26. This finding supports the use of lower BMIs to define obesity in these differing groups.  The study also showed the differences between South Asian sub-groups were small. The new BMI cut-offs were 21.5 in Pakistani men compared with 22.0 in Indian men, and 21.6 in Pakistani women compared with 22.3 in Indian men. Therefore, it would seem reasonable to apply the same cut-offs across all South Asian communities.  The results are published online ahead of print in the journal Diabetes Care.  Professor Jill Pell, Director of the Institute of Health and Wellbeing, points out this study was only possible because of the strengths of UK Biobank. It is a very large study with sufficient numbers of participants from all of the main ethnic groups. Therefore, he and his fellow researchers were able to produce separate cut-offs for each ethnic group.  “This study confirms that we need to apply different thresholds for obesity interventions for different ethnic groups. If not, we are potentially subjecting non-white groups to discrimination by requiring a higher level of risk before we take action,” he said. “Furthermore, a blanket figure for all non-white groups is inappropriate. We need to apply different thresholds for South Asian, Black and Chinese individuals.” Professor Naveed Sattar, of the Institute of Cardiovascular and Medical Sciences, agrees and argues that further research is needed to understand why South Asians get diabetes at much lower BMIs, but that in the meantime this study underlines the need for tailored advice for different ethnic groups.  Uduakobong Efanga Ntuk, a PhD student who conducted a large part of the research, said: “Obesity is the main cause of the worldwide increase in diabetes. Intervening at lower obesity cut-points in people from non-white descent could save many lives.  “Diabetes prevention programs need to be ethnic specific. People from South Asian, Chinese and Black descent need to be made aware that they are at a higher risk of diabetes. By adopting a healthy lifestyle including physical activity and a healthy diet, they can significantly reduce their risk.”   Age-adjusted body mass index and waist circumference cut-offs equivalent to conventional obesity thresholds by ethnic group and sex.     White South Asian  (Pakistani) South Asian (Indian) Chinese Black Men           BMI (kg/m2) 30 21.5 22 26 26 Waist (cm/inches) 102/40 78/30.7 80/31.5 88/34.6 88/34.6 Women           BMI (kg/m2) 30 21.6 22.3 24 26 Waist (cm/inches) 88/34.6 68/26.7 70/27.5 74/29 79/31 

New BMI Thresholds Suggested for Black Britons and other UK Ethnic Minorities

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