Pregnancy Health

The gut changes dramatically during pregnancy

Pregnancy causes dramatic, natural shifts in gut bacteria composition, driven by hormonal and dietary changes, and these shifts have been linked to gestational diabetes and pre-eclampsia, two of the most common pregnancy complications. Researchers believe this happens partly through increased gut permeability and inflammation, and partly through effects on how the body processes glucose and fat.

Real, if partial, benefits for gestational diabetes

A meta-analysis of 6 randomised controlled trials, covering 830 women with gestational diabetes, found that probiotic supplementation significantly reduced fasting insulin levels and insulin resistance. The same body of research found probiotics were not consistently effective at lowering fasting blood glucose itself, an honest, partial result rather than a fix for every metabolic marker involved in gestational diabetes.

Source: Gut Microbiome Changes in Gestational Diabetes

An honest gap around preventing complications altogether

A broader review covering 27 separate studies found no clear evidence that giving probiotics or prebiotics during pregnancy reduces the risk of preterm birth or of developing gestational diabetes in the first place. This is a useful distinction: once gestational diabetes is diagnosed, probiotics show a genuine, specific metabolic benefit, but using them to prevent pregnancy complications from occurring at all remains unproven. As with any probiotic, benefits depend on the bacteria being properly fed, particularly given how much pregnancy itself already reshapes the gut environment.

What this means for you

Pregnancy care, including screening for gestational diabetes and monitoring for pre-eclampsia, should always follow your midwife's or obstetrician's guidance, and any supplement, including probiotics, should be discussed with them first given pregnancy's unique safety considerations. If you're diagnosed with gestational diabetes, the trial evidence above is a reasonable basis for asking about a specific probiotic strain as an addition to standard dietary management, not a replacement for it. A varied, plant-rich diet throughout pregnancy supports the same gut bacteria this research ties to healthier metabolic outcomes. That's the same idea behind GutLab, everyday gut health starts with regularly feeding the microbiome a broad range of plant-rich ingredients.