Type 2 & other diabetes

Lifestyle and Metformin Interventions and Risk of Multimorbidity in Adults With Prediabetes

JAMAPublished Observational follow-up cohort study of a randomised clinical trial

Authors' conclusion

Among adults with prediabetes at baseline, lifestyle intervention, but not metformin, was associated with a lower burden of multimorbidity.

Study context

Population
Adults with prediabetes at high risk of diabetes enrolled in Diabetes Prevention Program (DPP)/DPP Outcomes Study (DPPOS), 27 US sites, with CMS morbidity data through 2021; median age 74 years, 68% femalewith CMS data
Participants
1,173 adults
Comparison
Intensive lifestyle intervention or metformin vs placebo
  • Lifestylen = 385
  • Metforminn = 385
  • Placebon = 403reference
Primary endpoint
Multimorbidity (≥2 of 15 prevalent conditions defined in CMS' Chronic Condition Data Warehouse)
Follow-up
Through 2021
Methodological detailsDPP/DPPOS, multicentre, 27 sites, long-term follow-up, Cox proportional hazard models, adjusted for relevant covariates
  • DPP/DPPOS
  • Multicentre
  • 27 sites
  • Long-term follow-up
  • Cox proportional hazard models
  • Adjusted for relevant covariates

Primary result

As reported in the abstract

Multimorbidity · end of follow-up
Each group vs placeboHazard ratio (95% CI)
Lifestyleadjusted for relevant covariates
0.79(0.68–0.93)
Metformin
0.91(0.78–1.07)

Further findings

OutcomeHR (95% CI)
Multimorbidity restricted to dyads of the costliest conditionsLifestylevs Placebo0.57 (0.38–0.85)

Multimorbidity excluding diabetes

These relationships persisted when diabetes was excluded from the multimorbidity definition

Original publication

Lifestyle and Metformin Interventions and Risk of Multimorbidity in Adults With Prediabetes. JAMA. Published 18 August 2026. doi:10.1001/jama.2026.8492

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