Iron Metabolism and Gestational Diabetes Mellitus

Iron is an essential micronutrient central to oxygen transport, cellular respiration and DNA synthesis. Dietary iron is absorbed predominantly in the duodenum, bound to transferrin in plasma and stored in ferritin complexes within hepatocytes and macrophages. Regulation of systemic iron levels is governed by the hormone hepcidin, which controls ferroportin-mediated iron export. During pregnancy, maternal iron requirements increase markedly to support placental development and foetal growth. However, excessive iron accumulation can catalyse the formation of reactive oxygen species, disrupt pancreatic β-cell function and provoke insulin resistance. Gestational diabetes mellitus (GDM) arises when insulin production cannot meet heightened metabolic demands, leading to glucose intolerance first recognised in pregnancy. Epidemiological and mechanistic studies have linked elevated biomarkers of iron status—haemoglobin, ferritin and transferrin saturation—to higher GDM risk. This dual challenge of preventing iron deficiency anaemia while avoiding iron overload poses a significant global public-health dilemma, driving research into personalised supplementation strategies, genetic modifiers of iron handling and novel pathways such as iron-dependent cell death.

Research from Nature Portfolio

Recent work has demonstrated that higher maternal haemoglobin levels in the first trimester—even within the normal physiological range—are independently associated with an increased risk of GDM. In a multicentre case–control cohort, women in the highest quartile of early-pregnancy haemoglobin exhibited elevated fasting glucose, impaired glucose tolerance and higher systolic and diastolic blood pressures. These associations persisted after adjustment for pre-pregnancy body mass index, age and other covariates, indicating that maternal haemoglobin may serve as a readily obtainable marker to stratify GDM risk and guide early interventions.

Iron Metabolism and Gestational Diabetes Mellitus publication trend

The graph below shows the total number of articles in iron metabolism and gestational diabetes mellitus across all publications each year (not limited to Nature Index journals).

Technical terms

Ferritin: Intracellular iron-storage protein and clinical marker of body iron stores.

Transferrin saturation: Percentage of transferrin molecules bound to iron, reflecting circulating iron availability.

Hepcidin: Liver-derived peptide hormone that inhibits ferroportin to regulate systemic iron export.

Ferroptosis: Iron-dependent form of regulated cell death driven by lipid peroxidation.

Haptoglobin genotype: Genetic variants of haptoglobin influence haemoglobin binding and oxidative stress.

HOMA-IR: Homeostasis Model Assessment for Insulin Resistance, an index derived from fasting glucose and insulin levels.

References

1. First-trimester hemoglobin, haptoglobin genotype, and risk of gestational diabetes mellitus in a retrospective study among Chinese pregnant women. Nutrition & Diabetes (2024).
2. Ferroptosis and its potential role in gestational diabetes mellitus: updated evidence from pathogenesis to therapy. Frontiers in Endocrinology (2023).
3. Iron, Oxidative Stress and Gestational Diabetes. Nutrients (2014).
4. Higher hemoglobin levels are an independent risk factor for gestational diabetes. Scientific Reports (2022).
5. Iron Supplementation in Pregnancy and Risk of Gestational Diabetes: A Narrative Review. Nutrients (2022).