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The science.

Blood lead quartile vs type 2 diabetes prevalence
Adjusted odds ratios from Tsoi et al. 2016 (NHANES 1999-2010, n=12,725 adults). Adjusted for age, sex, race/ethnicity, BMI, smoking, alcohol, income, physical activity. The dose-response relationship persists after full adjustment. A separate HbA1c analysis found +0.07% per doubling of blood lead level.
Source: Tsoi MF et al., Cardiovascular Research 2016; Rhee S et al., Korean NHANES 2013.