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  • Excessively high BMI...

Excessively high BMI associated with type 1 diabetes in otherwise healthy adolescents

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2022-06-07T11:30:11+05:30  |  Updated On 2022-06-07T15:41:20+05:30
Excessively high BMI associated with type 1 diabetes in otherwise healthy adolescents
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New research published in Diabetologia and presented at this year's annual meeting of the American Diabetes Association in New Orleans, Louisiana, USA, shows that excessively high body mass index (BMI) in adolescents is linked to development of type 1 diabetes (the form of the condition more associated with autoimmune complications), not just the type 2 form usually associated with excess...

New research published in Diabetologia and presented at this year's annual meeting of the American Diabetes Association in New Orleans, Louisiana, USA, shows that excessively high body mass index (BMI) in adolescents is linked to development of type 1 diabetes (the form of the condition more associated with autoimmune complications), not just the type 2 form usually associated with excess weight. The study is by Professor Gilad Twig, Sheba Medical Center, Israel and colleagues.

Type 1 diabetes has been traditionally referred to as childhood diabetes, occurring in children of any age and weight, although it can also develop in adolescence and well into adulthood. However, the rapidly increasing diabetes epidemic growing in almost all countries today consists mostly of cases of type 2 diabetes, linked to risk factors such as obesity/excess weight, low physical activity and increased sedentary behaviour.

More recently, studies in younger children have reported an association between increased BMI and risk for developing type 1 diabetes, but evidence in late adolescence is limited. This is of interest as approximately 50% of cases of type 1 diabetes developed after late adolescence (from age 18 years). In this new study, the authors analysed the association between BMI in late adolescence and incident type 1 diabetes in young adulthood.

In this nationwide study, all Israeli adolescents, ages 16–19 years, undergoing medical evaluation in preparation for mandatory military conscription between January 1996 and December 2016, were included for analysis unless they had a history of abnormal blood sugar. A total of 1.46 million adolescents were included. Data were linked with information about adult onset of type 1 diabetes in the Israeli National Diabetes Registry. Weight and height were measured at study entry, and statistical modelling used to calculate any excess risk of type 1 diabetes associated with overweight or obesity.

There were 777 new cases of type 1 diabetes during 15,819,750 person-years of follow-up (mean age at diagnosis 25 years). BMI was found to be associated with incident type 1 diabetes. In a model adjusted for age, sex and socio-demographic variables, the increased risk of type 1 diabetes increased as BMI increased.

Compared with those adolescents classified as optimal BMI (5th-49th age- and sex-matched BMI percentiles according to the US Centers for Diseases Control and Prevention [CDC]), adolescents with obesity (≥95th percentile) had double the risk of developing type 1 diabetes, while those with overweight (85th-94th BMI percentile) had a 54% increased risk of type 1 diabetes. A mild increased risk (41%) was evident in BMI values of the higher normal range (75th-84th BMI percentiles). For the entire BMI range authors reported that every 5 kg/m2 the adjusted risk to develop type 1 diabetes increases by 35%.

The authors discuss that there is growing evidence of a link between obesity and various autoimmune conditions. A possible explanation they provide is that the elevated levels of inflammatory adipokines and cytokines associated with obesity diminish self-tolerance by promoting proinflammatory processes that lead to diabetes.

They add: "Additional factors associated with obesity may contribute to the development of autoimmunity, including vitamin D deficiency, consumption of a high-fat diet, and modulation of the gut microbiota. Given that, in our cohort, there was an association between adolescent obesity and type 1 diabetes even when excluding those with pre-existing autoimmune conditions, additional factors may link obesity specifically to type 1 diabetes."

They explain that several biological mechanisms have been suggested to explain the association between obesity and type 1 diabetes. The 'accelerator' hypothesis suggests that both type 1 and type 2 diabetes are caused by insulin resistance set against various genetic backgrounds that affect the rate of loss of the insulin-producing beta cells in the pancreas and thereby ultimately resulting in clinical presentation of diabetes. According to this hypothesis, the increasing demand for insulin renders the beta cells more 'antigenic' (prone to auto-destruction), and thus accelerates their loss through autoimmune injury.

The authors conclude: "Our findings have public health implications. The prevalence of adolescent obesity is rising worldwide at an alarming rate, with dire projections for the near future. Currently it is estimated that nearly 60% of today's US youth (age range, 2-19 years) will develop obesity by age 35 years, most of them by adolescence, with half progressing to severe obesity. The current study projects that around 1 in 8 (12.8%) of the newly diagnosed cases of type 1 in the study can be attributed to abnormally excessive weight at adolescence. Thus, with rising levels of obesity, especially that of the severe form, we may expect that the current annual rise in type 1 cases (that ranges between +2% to +4% in most high-income countries) will be even more pronounced."

"Our study adds to the growing evidence regarding the health hazards associated with adolescent obesity. Not only is adolescent obesity correlated with adult onset of type 2 diabetes as previously reported, but also with type 1 diabetes. Further work needs to be done to unravel this association so that we can better address the full spectrum of risks posed by the obesity epidemic or identify common environmental factors affecting both weight and type 1 diabetes."

To read the full article, click on the following link:

https://doi.org/10.1186/s12916-017-0958-6

Diabetologia type 1 diabetes body mass index BMI childhood diabetes risk factors physical activity sedentary behaviour type 2 diabetes 
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as an Editor-in-Chief for the Speciality Medical Dialogues section. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Before Joining Medical Dialogues, he has served at important positions in the medical industry in India including as the Hony. Secretary of the Delhi Medical Association as well as the chairman of Anti-Quackery Committee in Delhi and worked with other Medical Councils in India. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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