Figure 6: Serum GIP, PYY and ghrelin (Cohort 3). Serum GIP was tested together with PYY and ghrelin at 6 wks post-surgery. Serum was collected after overnight fast or at 30 mins of free feeding following overnight fast. A. Serum GIP. B. Serum PYY. C. Serum ghrelin. The result is presented as mean ± SE (n=5-6). *p< 0.05 RYGB vs. sham by student’s test.