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Table 2 Changes in daily dietary intakes from pre- to 6 months post-surgery

From: Changes in gastrointestinal symptoms and food tolerance 6 months following weight loss surgery: associations with dietary changes, weight loss and the surgical procedure

  N Pre-surgery 6 months post-surgery Change a P-value
Energy, kJ/kcal 54 9859 (7533 to 12,424)/
2356 (1800 to 2969)
5298 (4272 to 6541)/
1266 (1021–1563)
− 4515 (− 6514 to − 2110)/
− 1079 (− 1557 to −504)
< 0.001*
Fat, g 54 89.7 (58.5 to 121) 45.0 (39.7 to 54.3) −36.0 (− 70.0 to − 15.7) < 0.001*
Fat, E% 54 35.6 (31.3 to 38.6) 34.3 (28.5 to 38.1) −1.25 (− 4.80 to 1.92) 0.159
Protein, g 54 103 (81.6 to 127) 65.1 (52.1 to 73.4) −39.6 (−54.2 to − 24.0) < 0.001*
Protein, E% 54 18.0 (15.9 to 19.6) 20.1 (18.2 to 22.3) 2.25 (0.05 to 5.47) < 0.001*
Carbohydrates, g 54 245 (194 to 318) 133 (94.5 to 174) − 111 (− 158 to −61.5) < 0.001*
Carbohydrates, E% 54 42.5 (40.1 to 46.7) 42.6 (35.7 to 47.1) −0.65 (−7.17 to 3.90) 0.247
Sugar, g 54 24.1 (14.3 to 42.5) 11.9 (4.57 to 22.9) −14.2 (−28.5 to −3.12) < 0.001*
Sugar, E% 54 4.80 (3.00 to 6.82) 3.70 (1.67 to 6.52) −1.10 (−3.87 to 1.25) 0.042*
Fiber, g 54 33.8 (9.42) 20.9 (7.91) −12.9 (9.85) < 0.001*
Water total, g 54 3602 (2816 to 4756) 2516 (2152 to 3120) − 1078 (− 1981 to − 148) < 0.001*
Food and beverages total, g 54 4357 (3389 to 5636) 2995 (2503 to 4190) − 1090 (− 2332 to −34.1) < 0.001*
  1. Data are given as median (25–75 percentiles) or mean (SD). a The changes were computed as post-surgery values minus pre-surgery values for each patient (paired samples). P-values were obtained by the Wilcoxon Signed Rank Test and the Paired-Sample T-test.* Statistically significant p < 0.05