INS and Insulin resistance: Namely, the lowest quartile of species diversity was related to higher concentrations of insulin (P = 0.07) and HOMA2-IR (homeostasis model assessment 2- insulin resistance) (P = 0.08) and lower QUICKI (quantitative insulin sensitivity check index) (P = 0.11) compared to the highest quartile, but no relationship was evident with glucose levels (P = 1.0) (Table 3).