Fig. 4.

Two-bottle preference test in sham-operated rats (n = 12, ■) and in gastric bypass rats (n = 18, ○) during the early phase experiment (postoperative day 10, A–C) and in gastric bypass (n = 10, ○) and sham-operated rats (n = 10, ■) during the late phase experiment (postoperative day 200, D–F). Seven Intralipid concentrations were used in ascending order: 0.005%, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 5%. A and D, preference; B and E, Intralipid intake; C and F, total calorie intake. Data are means ± SE. When 2-way ANOVA revealed a significant group × concentration interaction, post hoc Bonferroni test was used for concentration-to-concentration analysis between the 2 groups (**P < 0.01, ***P < 0.001).