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ABSTRACT Background Several studies have explored the impact of BMI on size and composition of urinary stones. Because there were controversies, a meta-analysis was necessary to be carried out to provide some evidence of the relationship of BMI and urolithiasis. Materials and Methods PubMed, Medline, Embase, Web of Science databases, and the Cochrane Library were searched up to August 12th 2022 for eligible studies. The urolithiasis patients were summarized into two groups: BMI < 25 and ≥ 25 kg/m2. Summary weighted mean difference (WMD), relative risk (RR) and 95% confidence intervals (CI) were calculated through random effects models in RevMan 5.4 software. Results A total of fifteen studies involving 13,233 patients were enrolled in this meta-analysis. There was no significant correlation of BMI and size of urinary stone (WMD -0.13mm, 95% CI [-0.98, 0.73], p = 0.77). Overweight and obesity increased the risk of uric acid stones in both genders and in different regions (RR=0.87, [95% CI] = 0.83, 0.91, p<0.00001). There was a higher risk of calcium oxalate stones formation in overweight and obesity group in total patients (RR=0.95, [95% CI] = 0.91, 0.98, p = 0.006). The relationship of BMI and calcium phosphate was not observed in this meta-analysis (RR=1.12, [95% CI] = 0.98, 1.26, p = 0.09). Sensitivity analysis was performed and indicated similar results. Conclusions The current evidence suggests a positive association between BMI and uric acid and calcium oxalate stones. It would be of great guiding significance to consider losing weight when treating and preventing urinary stones. controversies metaanalysis meta PubMed Medline Embase databases th 202 groups 2 kgm2 kgm kg m2 m kg/m2 WMD, WMD , (WMD) RR (RR 95 (CI 54 5 4 5. software 13233 13 233 13,23 metaanalysis. analysis. 0.13mm, 013mm mm 0 13mm -0.13mm 098 98 [-0.98 0.73, 073 0.73 73 0.73] 0.77. 077 0.77 . 77 0.77) RR=0.87, RR087 87 (RR=0.87 [95 083 83 0.83 091 91 0.91 p<0.00001. p000001 p<0.00001 00001 p<0.00001) RR=0.95, RR095 (RR=0.95 0.98 0.006. 0006 0.006 006 0.006) RR=1.12, RR112 1 12 (RR=1.12 126 26 1.26 0.09. 009 0.09 09 0.09) results 20 kg/m 9 1323 23 13,2 0.13mm [-0.9 07 0.7 7 RR=0.87 RR08 8 (RR=0.8 [9 08 0.8 0.9 p00000 p<0.0000 0000 RR=0.95 RR09 (RR=0.9 000 0.00 00 RR=1.12 RR11 (RR=1.1 1.2 0.0 132 13, [-0. 0. RR=0.8 RR0 (RR=0. [ p0000 p<0.000 RR=0.9 RR=1.1 RR1 (RR=1. 1. [-0 RR=0. (RR=0 p000 p<0.00 RR=1. (RR=1 [- RR=0 (RR= p00 p<0.0 RR=1 RR= p0 p<0. p<0 p<