Comparison 1. Low FODMAP diet versus sham diet.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Pain frequency defined by days of pain by IBS‐SSS scores (0 to 100) for IBD	1	52	Mean Difference (IV, Random, 95% CI)	‐2.00 [‐15.86, 11.86]
1.2 Days with moderate or severe pain by GSRS scores for IBD (0 to 3) for IBD	1	52	Mean Difference (IV, Random, 95% CI)	0.40 [‐0.44, 1.24]
1.3 Pain frequency defined by days of pain by IBS‐SSS scores (0 to 100) for CD	1	26	Mean Difference (IV, Random, 95% CI)	‐12.00 [‐114.55, 90.55]
1.4 Pain intensity IBD (0 to 100)	2	82	Mean Difference (IV, Random, 95% CI)	‐8.46 [‐15.76, ‐1.16]
1.5 Pain intensity IBD (0 to 3)	1	52	Mean Difference (IV, Random, 95% CI)	0.20 [‐8.67, 9.07]
1.6 Pain intensity CD (0 to 100)	1	26	Mean Difference (IV, Random, 95% CI)	‐8.00 [‐66.27, 50.27]
1.7 Withdrawals due to adverse events	1	52	Risk Ratio (M‐H, Random, 95% CI)	1.85 [0.18, 19.19]