GSTM1 and anemia: Compared with Q1, Q3, and Q4 groups, the Q2 group had a lower proportion of participants with hypertension, heart attack, stroke, and CKD, as well as the highest RBC counts; however, compared with the Q1, Q2, and Q4 groups, a lower proportion of individuals in the Q3 group had DM, CHF, angina, and anemia, while they had the highest levels of Hb, mean energy intake, protein intake, folic acid intake, vitamin B12 intake, and iron intake.