Fig. 2.

(a) Forest plot for the association between dietary acid load and BMI in cohort studies by the random-effect model; (b) Forest plot for the association between dietary acid load and BMI in cross-sectional studies by the random-effect model. The study-specific effect size (expressed as weighted mean difference (WMD)) and 95 % CI are represented by the solid diamond and horizontal line, respectively; the area of the grey square is proportional to the specific-study weight to the overall meta-analysis. The centre of the open diamond and the vertical dashed line represent the pooled effect size, and the width of the open diamond represents the pooled 95 % CI