While the findings are exploratory, the researchers in China noted that the evidence may inform future microbiota- and nutrition-oriented strategies for postpartum mental health management.
“Collectively, these findings suggest that PPD is associated with alterations in gut microbiota and metabolite profiles, including lipid-related, neuroinflammation, and steroid-related metabolic features,” wrote researchers at The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine in China in Nutrients
Miguel Toribio-Mateas, clinical neuroscientist and nutrition researcher, told NutraIngredients that the microbiome-postpartum depression connection is something he’s been following for some time: “It makes biological sense because the postpartum period brings very substantial changes in hormones, immune function, metabolism, sleep and diet, while the gut microbiome is itself dynamic. We also already have a wider body of research linking depression with differences in gut microbial ecology and gut-brain signalling.”
“I found this study interesting because it looks at the microbiome AND circulating metabolites together,” he added.
“The changes in taxa such as Faecalibacterium and Akkermansia are interesting, but the fact they’re measured alongside lipid- and inflammation-related metabolic signals, give us better, more useful clues about the possible pathways involved”.
The study
A total of 63 participants were involved in the study, comprising women aged 20 to 49 with PPD and healthy controls. The researchers used appropriate evaluation scales and interviews to assess the severity and frequency of participants’ depressive symptoms and collected fecal and serum samples. They analyzed the gut microbiota and serum metabolites using DNA sequencing and metabolomics and compared the groups using statistical analysis.
The researchers observed significant alterations in gut microbial composition in the PDD group, including decreased Faecalibacterium and Akkermansia and increased Ralstonia and Fusobacterium.
They noted that previous evidence suggests that Faecalibacterium is inversely related to depressive symptom severity. This strain enhances gut barrier integrity by producing short-chain fatty acids (SCFAs), helping prevent inflammation and its effects on hormones and the brain. Akkermansia strains have similar beneficial effects on the microbiota–gut–brain axis, attenuating neuroinflammation.
They also found differences in serum metabolites including Lysophosphatidylethanolamine (LPE), a lipid metabolite associated with neuroprotection.
Future steps
Noting the small sample size and study limitations, Toribio-Mateas thinks we are some way from being able to recommend a particular supplement for postpartum depression; the intervention evidence is still limited and mixed, and probiotic effects are highly strain-specific.
“For me, the next important step would be longitudinal research following women from pregnancy through the postpartum period, combining microbiome and metabolomic measurements with hormones, inflammation, diet, medication and antibiotic exposure, sleep and clinical mental-health outcomes,” he said.
“Also, maternity comes tangled with routine changes, work leave, identity changes, etc., which would benefit from being explored qualitatively. That would then give us a much stronger basis for well-powered, strain-specific probiotic, prebiotic or dietary intervention trials,” he added.
Source: Nutrients; https://doi.org/10.3390/nu18152562; “Alterations in Gut Microbiota and Serum Metabolome Are Associated with Postpartum Depression.” Authors: S. Li et al.
