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Offspring birth weight, gestational age and maternal characteristics in relation to glucose status at age 53 years:
1MRC National Survey of Health and Development, MRC Unit for Lifelong Health and Ageing, Royal Free and University College Medical School, London, UK. d.kuh@nshd.mrc.ac.uk
Insights
Investigating birth weight and maternal diabetes risk, this study found pathways linking early life factors to later health. Higher birth weight in offspring may indicate lower maternal glucose levels, influenced by social class.
Area of Science:
- Reproductive Health
- Endocrinology
- Public Health
Background:
- Offspring birth weight is a potential indicator of maternal health.
- Understanding links between early life factors and later maternal diabetes risk is crucial for public health.
- Maternal factors during pregnancy and early life can influence long-term health outcomes.
Purpose of the Study:
- To investigate the pathways connecting offspring birth weight to maternal diabetes risk later in life.
- To examine the role of early-life and adult maternal factors in this relationship.
- To identify potential public health interventions for diabetes prevention.
Main Methods:
- Utilized a national birth cohort study design.
- Examined the relationship between offspring birth weight and maternal glycated haemoglobin (HbA1c) at age 53.
- Included 581 mothers with first birth data between ages 19-25, with adjustments for confounders like BMI and gestational age.
Main Results:
- A negative association was found between offspring birth weight and maternal HbA1c, largely mediated by gestational age.
- Maternal childhood social class significantly interacted with offspring birth weight, affecting maternal HbA1c.
- Higher offspring birth weight was linked to lower maternal HbA1c in mothers from manual backgrounds, but not non-manual backgrounds.
Conclusions:
- Short gestational age and low birth weight may indicate impaired early maternal growth, linking to later diabetes risk.
- Higher offspring birth weight may also be part of a pathway influencing later maternal glucose status.
- Further research in diverse cohorts is needed to assess public health initiatives targeting these pathways.
Aims:
We investigated pathways linking offspring birth weight to maternal diabetes risk in later life by taking into account a range of prospective early-life and adult maternal factors.
Methods:
In a national birth cohort study, we examined the relationship between offspring birth weight and maternal glycated haemoglobin (HbA1c) at age 53 years in 581 mothers who had a first birth between age 19 and 25 years, and had data on potential confounders or mediators.
Results:
Mean age at first birth was 21.5 years. After adjustment for maternal body mass index (BMI), mean percentage change in maternal HbA1c per kilogram increase in offspring birth weight was -1.8%[95% confidence interval (CI) -3.5, -0.1; P = 0.03]. This relationship was mostly accounted for by gestational age that was inversely related to maternal HbA1c (-0.9%; 95% CI -1.5, -0.4; P = 0.001). Other risk factors for high HbA1c were smoking and high BMI at 53 years. There was a significant interaction between offspring birth weight and maternal childhood social class (P = 0.01). Mothers from a manual background with higher birth weight offspring had lower HbA1c (BMI adjusted: -3.1%; 95% CI -5.0, -1.1); this was not observed for mothers from a non-manual background (BMI adjusted: 1.9%; 95% CI -1.3, 5.0).
Conclusions:
Short gestational age and low offspring birth weight may be part of a pathway linking impaired early maternal growth to diabetes risk in later life. A second possible pathway linking higher offspring birth weight to later maternal glucose status was also identified. These potential pathways require further investigation in cohorts with a wider maternal age range so that the early targeting of public health initiatives can be assessed.
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