Science20th centuryChinahigh confidence

In 1986, 33 clinics in Da Qing, China, were randomly assigned to control or to diet, exercise, or combined diet-and-exercise interventions for 577 adults with impaired glucose tolerance.

Notes on verification

Confirmed by multiple independent, high-quality sources including peer-reviewed journal abstracts (Diabetes Care, Diabetologia, Lancet Diabetes & Endocrinology) and PubMed, all matching the claim's details precisely. [tier=gold indep_score=1.0 clusters=4 claim_tier=notable]

Sources