PTH and Insulin resistance: OB people also had lower IGF1 (P < 0.05) (Fig. 2A and B), and 25OHD (P < 0.001) (Fig. 2C and D) and higher PTH (P < 0.05) (Fig. 2E and F), insulin (Fig. 2G and H), glucose, homeostatic model assessment for insulin resistance (HOMA-IR) (all P < 0.001) than NW people.