Through the Microbial Looking Glass: Premature Labor, Preeclampsia, and Gestational Diabetes: A Scoping Review.
Alexis B Dunn, Lisa Hanson, Leona VandeVusse and 1 others
PMID 30676461WHAT IT FOUND
Probiotic intake was associated with lower preeclampsia risk and improved glucose markers in gestational diabetes, but evidence for preventing preterm birth was inconsistent and insufficient.
No single probiotic strain or dose was proven effective across all conditions.
Key findings
01High-level probiotic intake was associated with a significant reduction in all preeclampsia (OR=0.80, 95% CI: 0.66–0.96) and severe preeclampsia (OR=0.61, 95% CI: 0.43–0.89).
02Probiotic interventions resulted in a significant decrease in fasting serum insulin and HOMA model assessment for insulin resistance, but outcomes related to lipids, gestational age, and inflammatory markers did not reach statistical significance.
03Systematic reviews found no evidence that probiotic interventions altered the incidence of preterm birth, while one RCT in high-risk women showed significantly less spontaneous preterm birth with probiotics.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
Article quality was not assessed, so the strength of evidence from individual studies is unknown. Probiotic strains, dosages, and delivery methods varied greatly across studies, making it difficult to identify a specific effective intervention. Microbiome findings were inconsistent, with no common pathogenic organisms identified across studies for any condition. For preterm birth, many studies included high-risk groups (e.g., obese women, those with GDM), limiting generalizability to low-risk populations. The review is a scoping review, not a systematic review with meta-analysis, so it maps the literature rather than quantifying effect sizes.
Declared interests
The authors have no conflicts of interest to disclose.
The easy way to misread this
Do not recommend probiotics as a proven prevention for preterm birth. Systematic reviews found no evidence that probiotic interventions altered preterm birth incidence, and the one positive RCT was in a high-risk group. The association with reduced preeclampsia risk comes from observational data, not randomized trials, so causality is not established.