Table 2.

Within-group comparisons for food preference tests 1 and 2

Group	Caloric intake before food preference test (kcal/day)	Caloric intake during food preference test (kcal/day)	Effect of food preference test (p value)	Effect of time (p value)	Interaction (food preference test × time) (p value)
Food preference test 1
HFDF-SH (n = 5)	97.6 ± 2.5	164.0 ± 5.2	<0.0001	0.41	0.11
HFDF-GB (n = 5)	77.3 ± 2.6	70.3 ± 4.2	0.054	0.58	0.26
LFDF-SH (n = 6)	107.0 ± 2.2	177.6 ± 4.2	<0.0001	0.32	0.03
LFDF-GB (n = 8)	75.0 ± 1.6	64.6 ± 1.9	0.022	0.79	0.91
Food preference test 2
HFDF-SH (n = 5)	86.9 ± 1.5	106.6 ± 1.7	<0.0001	0.92	0.60
HFDF-GB (n = 5)	96.6 ± 3.6	77.6 ± 2.2	0.0004	0.89	0.34
LFDF-SH (n = 6)	90.3 ± 2.4	127.5 ± 2.0	<0.0001	0.98	0.73
LFDF-GB (n = 8)	93.0 ± 2.9	95.0 ± 3.5	0.63	0.44	0.15

Data are presented as mean ± standard error of the mean (SEM). To discern the effect of each food preference test on measures within each of the four groups (before vs. during the food preference test), a two-way analysis of variance (ANOVA) (food preference test × time in days) was performed for each of the four groups. The post hoc comparisons for time are not shown for simplicity and relevance

HFDF high-fat diet fed, SH sham procedure, GB gastric bypass, LFDF low-fat diet fed