A review published in the International Journal of Molecular Sciences suggests that taking probiotics during pregnancy may help reduce a mother's long-term risk of developing metabolic syndrome: a cluster of conditions including high blood pressure, elevated blood sugar, excess body fat, and abnormal cholesterol levels that significantly raise the risk of heart disease and type 2 diabetes. Researchers from the Medical University of Lublin examined how probiotic supplementation during pregnancy may prevent three key pregnancy complications (gestational diabetes, preeclampsia, and excessive weight gain) each of which is independently linked to metabolic syndrome later in life.

Study Overview

Researchers conducted a comprehensive literature review examining the relationship between probiotic use during pregnancy and the development of metabolic disorders both during and after pregnancy. The review pulled from randomized controlled trials, animal studies, and clinical data to assess how probiotics influence gut microbiota, insulin resistance, blood pressure, lipid metabolism, and inflammation in pregnant women. Special attention was given to three pregnancy-specific conditions: gestational diabetes mellitus (GDM), preeclampsia, and excessive gestational weight gain. This is because women who experience any one of them face a significantly elevated risk of developing metabolic syndrome within years of delivery.

Key Findings

• Women with a history of gestational diabetes are 3 to 6 times more likely to develop metabolic syndrome than women with normal blood sugar during pregnancy, and 7 to 10 times more likely to develop type 2 diabetes.
• Specific probiotic strains reduced fasting blood glucose, lowered insulin resistance, improved HDL cholesterol, and decreased markers of inflammation in women with gestational diabetes.
• One randomized study found that probiotic supplementation reduced gestational diabetes incidence by more than 60%, with a 13% occurrence rate in the probiotic group compared to 34% in the control group.
• Probiotic consumption was associated with a meaningful reduction in the risk of preeclampsia, specifically milk-based products containing Lactobacillus acidophilus, Bifidobacterium lactis, and Lactobacillus rhamnosus. 
• Probiotics appear to work by reducing lipopolysaccharide-driven inflammation, improving gut barrier integrity, producing short-chain fatty acids that enhance insulin sensitivity, and modulating the immune response to lower systemic inflammation.

Why It Matters

Pregnancy is increasingly being recognized as a window into a woman's long-term health. The metabolic stress placed on the body during pregnancy can expose underlying vulnerabilities, and in some cases, trigger a cascade of conditions that persist for decades afterward. Between 28% and 60% of women who develop gestational diabetes will go on to develop metabolic syndrome later in life. Women who experience preeclampsia face a 2 to 7 times higher risk of cardiovascular disease and a fourfold increased risk of stroke. Excessive gestational weight gain compounds both risks.

What makes this research compelling is the idea that a relatively simple, safe, and widely available intervention taken during pregnancy could interrupt that trajectory before it begins. Rather than waiting to manage metabolic syndrome after it develops, probiotic supplementation offers a potential preventive entry point at a critical biological moment.

Takeaways

The evidence isn't definitive: researchers note that study results are mixed and that optimal probiotic strains, dosages, and treatment durations haven't yet been established. But the overall direction of the data is encouraging, and probiotics are considered safe and well-tolerated during pregnancy. Women who are pregnant or planning to become pregnant may want to discuss probiotic supplementation with their OB or midwife, particularly if they have risk factors for gestational diabetes or preeclampsia:

• Consider a multi-strain probiotic containing Lactobacillus acidophilus, Lactobacillus casei, and Bifidobacterium bifidum, the combination most consistently associated with improved glycemic and lipid markers in clinical trials.
• Food-based sources may be preferable to supplements. Research suggests that probiotics delivered through fermented foods like yogurt may be better absorbed and tolerated than those in capsule form.
• Pair probiotics with lifestyle support. The strongest outcomes in the reviewed studies came from combining probiotic supplementation with dietary counseling and regular physical activity, not probiotics alone.
• Continue postpartum monitoring. Women who experience gestational diabetes or preeclampsia should be followed closely after delivery for signs of metabolic syndrome, regardless of whether they took probiotics during pregnancy.

Read the Research: International Journal of Molecular Sciences. Effects of Probiotic Supplementation during Pregnancy on the Future Maternal Risk of Metabolic Syndrome. July 26, 2022. https://doi.org/10.3390/ijms23158253