GSTM1 and diabetes mellitus: In a cross-sectional survey of 500 adults from five randomly selected villages in Chamba, a mountainous Tehri Garhwal district in Uttarakhand in north-west India, we determined the prevalence of diabetes (hemoglobin (Hb) A1c ≥ 6.5%) and pre-diabetes (5.7% ≤ HbA1c ≤ 6.4%).