Total calorie intake from postoperative day 10 until the end of the study for the A HFDF-SH (n = 5, filled circles), B HFDF-GB (n = 5, empty circles), C LFDF-SH (n = 6, filled squares), and D LFDF-GB (n = 8, empty squares) groups. Data are presented as mean ± standard error of the mean (SEM). HFDF high-fat diet fed, LFDF low-fat diet fed, SH sham procedure, GB gastric bypass, FPT 1 food preference test 1, FPT 2 food preference test 2