INS and Insulin resistance: There is a negative correlation between Vit B12 and HOMA-IR and in addition to this, FEV1: FVC% correlates negatively with BMI (0.53), WHR (0.50), glucose (0.68), insulin (0.68), Insulin resistance (0.80), and a positive correlation between FEV1: FVC% and Vit B12 (0.73) (Figures 1-7).