New Research Reveals How Type 1 Diabetes Affects the Placenta During Pregnancy

Researchers collected blood samples from 200 people with typical pregnancies and 151 people with Type 1 diabetes at three points during pregnancy: early on (10-14 weeks), in the middle (24-32 weeks), and near the end (34-40 weeks).

They focused on tiny particles called small extracellular vesicles that are released by the placenta into the mother's bloodstream. These particles carry information about what the placenta is doing—kind of like messengers that reflect the placenta's current state.

The researchers used advanced laboratory techniques to analyze the lipids (fats) in these placental particles and looked for patterns that might differ between the two groups.

The placental particles from people with Type 1 diabetes were larger and less abundant than those from people without diabetes. This suggests the placenta may be handling stress or metabolic demand differently.

The chemical makeup of the lipids in these particles changed at different rates across pregnancy in T1D versus non-T1D pregnancies. This indicates that the placenta's metabolic adaptation—the normal biological adjustments pregnancy demands—may be disrupted in Type 1 diabetes.

These lipid pattern differences might help explain why Type 1 diabetes during pregnancy can affect fetal development and metabolic health, though the study was not designed to prove this directly.

Type 1 diabetes in pregnancy carries known risks for both mother and baby, including higher rates of pregnancy complications and altered fetal growth. Understanding how the placenta functions differently in T1D could eventually lead to better monitoring and care.

The placental particles used in this study could eventually become part of a simple blood test. Rather than relying only on glucose monitoring, doctors might one day use this kind of test to get a fuller picture of how the placenta is coping with the demands of T1D pregnancy.

This research was designed to identify patterns and explore how the placenta works in T1D pregnancy. It is an important first step, but much more research is needed before any clinical applications become available.

This study was conducted through two established pregnancy research programs: the Ontario Birth Study and the CONCEPTT trial, which has been tracking pregnancies in people with Type 1 diabetes. The research was published in The Journal of Clinical Endocrinology & Metabolism in October 2026.

The findings come from basic science research designed to understand biological mechanisms, not to evaluate treatments or provide guidance for individual pregnancies. If you are pregnant with Type 1 diabetes, continue following your healthcare team's recommendations for glucose management and prenatal care.

Source: The Journal of clinical endocrinology and metabolism. Evidence type: PubMed indexed literature. Type1Cure is an information and intelligence hub, not a medical advice service. This article summarizes published research and does not provide diagnosis, treatment, or personal medical guidance. Always talk to your own care team before changing anything about your Type 1 diabetes management.