Neither olive oil nor C4-dietary oil had effects on iAUC for PYY, although our previous study demonstrated a clear PYY-stimulating effect of equimolar doses of both C8-dietary oil and olive oil in healthy subjects.12 Whether this difference in PYY responses is due to testing the oils on overweight patients with T2D as compared to the previous study, where they were tested on healthy subjects is at present not clear. The gene discussed is PYY; the disease is type 2 diabetes mellitus.