Dr. Axe Wire · Study decoded · gut

Gut Microbiome Maturation Pattern Linked to Threefold Higher Type 1 Diabetes Risk in Children

A six-year study of high-risk children found that how gut bacteria mature in the first two years, not just which bacteria are present, predicts type 1 diabetes risk years later.

By Dr. Axe Editorial Team · September 21, 2026 · 1 source · Understand

A prospective study published in Nature Metabolism found that children whose gut bacteria community stalls out early in life have more than three times the risk of developing type 1 diabetes compared with children whose gut bacteria mature on a typical timeline.

887children, 6-year study

3xhigher T1D risk

Researchers followed 887 children at high genetic risk for type 1 diabetes across six clinical centers in Finland, Sweden, Germany and the United States, collecting 12,151 stool samples over up to six years in the TEDDY study. Tracking how each child's gut microbiota, the community of microbes living in the gut, changed from its own baseline over the first 800 days, the team identified three patterns: Early Matured (172 children), Late Matured (311 children) and Early Plateaued (111 children). Children with the Early Plateaued pattern, whose gut bacteria diversity stayed low throughout, had 3.21 times the risk of type 1 diabetes or its early immune marker versus the Early Matured group, and 3.33 times the risk versus the Late Matured group. The absolute rate was 1.52 cases per 1,000 person-months in the Early Plateaued group versus 0.86 and 0.95 in the other two groups. The Late Matured pattern alone carried no added risk, but its link to diabetes flipped direction depending on a child's immune-related genetic variants.

The authors report that the Early Plateaued pattern showed higher microbial production of branched-chain amino acids and relied on a smaller, less diverse set of bacterial species, while the Early Matured pattern showed early production of B vitamins and aromatic amino acids plus genes for breaking down milk sugar. This suggests early-colonizing bacteria, mainly Bifidobacterium and Ruminococcus species, dominate instead of a more diverse community taking over on schedule. Overall genetic background barely affected early microbiome development, but immune-related gene variants tied to antimicrobial and antiviral defense changed whether the Late Matured pattern raised or lowered a child's risk.

Type 1 Diabetes Risk by Gut Microbiome Maturation Pattern (887 Children)

TEDDY cohort, 887 children, up to 6 years follow-up

Early Plateaued

1.52 cases per 1,000 person-months

Late Matured

0.95 cases per 1,000 person-months

Early Matured

0.86 cases per 1,000 person-months

Nature Metabolism, 2026, Dong et al.

This is an observational study in children already at high genetic risk for type 1 diabetes, so it cannot show that changing a child's gut bacteria would change disease risk, and the findings have not yet been tested in children at average genetic risk.

Dr. Axe’s Take

This tells me timing matters as much as which bacteria show up. A gut microbiome that gets stuck in a low-diversity holding pattern, dominated by early colonizers instead of maturing into a richer mix, tracks with a much higher type 1 diabetes risk in genetically vulnerable kids. For parents, I'd prioritize breastfeeding as long as reasonably possible, introduce a wide variety of whole, fiber-rich foods once solids start, and avoid unnecessary antibiotics in the first two years. Fermented foods like kefir and sauerkraut can help diversify a toddler's gut community. Keep well-child visits and recommended screening on schedule.

— Dr. Axe

Take the Gut Health Quiz →

Study summary

Who: 887 children at high genetic risk for type 1 diabetes, enrolled at 6 clinical centers in Finland, Sweden, Germany and the USA (TEDDY study)
Design: Prospective, multicenter observational cohort; 12,151 longitudinal stool metagenome samples analyzed alongside host genetic data
Dose: Not applicable, observational study with no intervention; microbiome patterns tracked over the first 800 days of life, with follow-up to 6 years
Primary result: Early Plateaued gut microbiome pattern (n=111) linked to 3.21 times the risk of type 1 diabetes/seroconversion vs Early Matured pattern (n=172), and 3.33 times the risk vs Late Matured pattern (n=311); absolute rates were 1.52 vs 0.86 and 0.95 cases per 1,000 person-months
Secondary: Late Matured pattern (n=311) showed no overall risk difference vs Early Matured (risk ratio 0.96), but its T1D association flipped direction depending on a child's immune-related genetic variants (PC3); Early Plateaued pattern showed increased microbial production of branched-chain amino acids
Funding / conflicts: Funder listed in the journal record: National Institutes of Health. Conflicts declared in the PubMed record: one author is a member of the scientific advisory boards of Zoe Nutrition, Empress Therapeutics and Seres Therapeutics; all other authors declare no competing interests.
Date: Sep 21, 2026