Babies Born Underweight More Likely to Develop Type 2 Diabetes at a Younger Age

by Adeline Dorcas on  September 19, 2019 at 10:03 AM Child Health News
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Underweight babies are more prone to type 2 diabetes more than a year earlier, reports a new study.
Babies Born Underweight More Likely to Develop Type 2 Diabetes at a Younger Age
Babies Born Underweight More Likely to Develop Type 2 Diabetes at a Younger Age

Previous research has shown that people born weighing 2.7 kg (6 lbs) or less face an increased risk of developing type 2 diabetes (T2D) as adults. New research being presented at this year's European Association for the Study of Diabetes (EASD) Annual Meeting in Barcelona, Spain is the first study to show that babies born underweight are more likely to develop type 2 diabetes at a younger age (by more than one year) and have less severe obesity at the time of diabetes diagnosis with higher concentrations of HDL cholesterol (known as good cholesterol).

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"Our observational study of more than 48,000 births is important as it shows, for the first time, that irrespective of other clinical factors such as sex, body-mass index, and cholesterol levels at diagnosis, a low birthweight is associated with increased susceptibility to type 2 diabetes at a younger age", says Mr Christian Paulina, a medical student from the University of Dundee, UK who conducted the research.

"This link between low birthweight and age of onset of diabetes may reflect common genetic factors that both mediate birthweight and diabetes risk, or intrauterine factors such as nutrition or maternal smoking, or the combination of the two."

While the link between low birthweight and risk of developing type 2 diabetes in later life is well established, its association with the phenotype (physical characteristics) of type 2 diabetes once it develops is less clear cut.

In this study, researchers from the University of Dundee linked more than 48,000 individuals enrolled in the Walker Birth Cohort who were born in Dundee, Scotland between 1952 and 1966 to Scotland's national diabetes registry. They then investigated the impact of low birthweight on the phenotype of type 2 diabetes at diagnosis including age at diagnosis, body mass index [BMI], creatinine [a marker of kidney function], serum alanine aminotransferase [ALT; an enzyme that reflects liver function], HDL cholesterol, triglycerides [type of fat in the blood], and systolic blood pressure.

They found that compared with a baby born weighing over 3.6kg (the top 25% of birthweights in the cohort), being born with a low birthweight (<2.9 kg) was associated with younger age of onset of diabetes (50.0 years vs 51.3 years); a lower BMI at diagnosis (34kg/m2 [obese] vs 36kg/m2 [severely obese]); and higher HDL-cholesterol at diagnosis (1.13 mmol/L vs 1.09 mmol/L).

Further analyses showed that the effect of birthweight on age of diabetes diagnosis was not influenced by other clinical factors suggesting that low birthweight affects the risk of developing type 2 diabetes in the same way irrespective of your BMI and HDL cholesterol, in adulthood.

The research team also found that whilst men had a slower progression to insulin treatment, birthweight (standardized for gestational age and sex) did not have a significant impact on diabetes progression.

While measures of insulin production were not available, the authors conclude that the mechanism linking low birthweight to younger onset slimmer patients with type 2 diabetes may be connect to reduced insulin secretion--both in the womb and later life.

Source: Eurekalert

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