Figure 17 displays a forest plot of healthful diet trials reporting between-group differences in glucose tolerance after low-fat and general heart-healthy dietary counseling. Data for the figure are presented alongside the forest plot. In the moderate-intensity (31 to 360 minutes) subgroup (2 trials) the combined unstandardized weighted mean difference was −1.41 (95% CI, −3.94 to 1.11). In the high-intensity (more than 360 minutes) subgroup (3 trials) the combined unstandardized weighted mean difference was −0.10 (95% CI, −0.23 to 0.03).The overall unstandardized weighted mean difference for all 5 healthful diet trials was −0.63 (95% CI, −1.20 to −0.05), indicating that there was a statistically significant decrease in glucose tolerance. However, there was quite significant statistical heterogeneity, both within the moderate-intensity subgroup (chi-square=99.1%; p=0.000) and the high-intensity subgroup (chi-square=77.4%; p=0.012) and between the two subgroups (chi-square=98.8%; p=0.000).

Figure 17Meta-Analysis of Healthful Diet Trials, General Counseling (KQ2): Glucose

From: 3, Results

Cover of Behavioral Counseling to Promote Physical Activity and a Healthful Diet to Prevent Cardiovascular Disease in Adults
Behavioral Counseling to Promote Physical Activity and a Healthful Diet to Prevent Cardiovascular Disease in Adults: Update of the Evidence for the U.S. Preventive Services Task Force [Internet].
Evidence Syntheses, No. 79.
Lin JS, O’Connor E, Whitlock EP, et al.

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