CCKBR and type 2 diabetes mellitus: To ascertain the role of intestinal epithelial cell Cckbr in T2D, 4‐mo old Villin‐Cckbr+/+ and Villin‐Cckbr−/− mice were fed either normal‐fat diet (ND, 10% fat) or high‐fat diet (HFD, 60% fat) for 3 months.