Yoghurt consumption is associated with changes in the composition of the human gut microbiome and metabolomeOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This large population study asked whether yoghurt consumption is linked to gut microbiome composition, faecal metabolites, and metabolic health. It combined dietary questionnaires with sequencing. Gut microbiota were profiled by 16S rRNA gene sequencing and whole shotgun metagenomic sequencing. Faecal metabolomics measured 1116 metabolites. Models adjusted for age, sex, BMI, family structure, and habitual diet using a Healthy Eating Index. Findings were tested for replication in a separate Dutch cohort, and 24-hour food records checked whether effects were transient.
Who was studied?
Participants were from the TwinsUK registry, a predominantly older, white, female British cohort of adult twins aged 18 to 89 years. In total 4117 completed a food frequency questionnaire. Of these, 1092 never ate yoghurt and 3025 ate it at least weekly, averaging 4.67 times per week. Microbiome subsets included 1057 and 400 yoghurt eaters for 16S and shotgun data. Replication used 1103 volunteers from the LifeLines-DEEP cohort in the Netherlands, where 1010 were yoghurt consumers and 93 were not.
What were the most important findings?
Yoghurt eaters had lower visceral fat mass (beta = -28.18 g, p = 0.016 after diet adjustment) and a healthier eating pattern. 16S data showed higher alpha diversity (Shannon beta = 0.05, p = 0.004). Two species rose with consumption: Streptococcus thermophilus (beta = 0.41, p = 6.14e-14) and Bifidobacterium animalis subsp. lactis (beta = 0.30, p = 1.49e-8), both dose-dependent. S. thermophilus replicated in LifeLines-DEEP. B. animalis subsp. lactis correlated with 13 faecal metabolites, including 3-hydroxyoctanoic acid, an HCA3 receptor agonist linked to reduced gut inflammation. Food records showed the bacterial increase was transient.
What are the greatest implications of this study?
Yoghurt consumption tracks a healthier diet, lower visceral fat, and detectable gut increases in the live bacteria contained in the product. These yoghurt bacteria appear transient, not durable colonizers. Because the increase depended largely on eating yoghurt within the prior 24 hours, detection of these species mainly signals recent intake rather than lasting engraftment. The metabolite link, especially 3-hydroxyoctanoic acid, hints at how yoghurt bacteria might influence gut inflammation. This is a cross-sectional observational study, so it cannot prove that yoghurt causes the metabolic benefits.