Table 5

Effects of Increased Fiber Intake on Changes in HbA1c%

Meta-analysis Authors and DateNo. of Studies in Meta-analysisNo. of Participants in Meta-analysisFiber Type and Dose/DayMean Duration in WeeksReduction in HbA1c%Q Test
P Value and I2 Statistic
Egger or Begg Test P ValueQuality Assessment and Outcome
Post et al, 201223a10 T2D324Soluble 16 g8↓ 0.26, P < .05NS, 21%GRADE
9/10 high quality
Silva et al, 20132411 T2D605Soluble 15 g11↓ 0.52, P < .05P < .001, 94%NSGRADE
NR
Hou et al, 2015296 T2D437β-Glucan NR4.5↓ 0.42, P < .001NS, 18%NOS
5/6 high quality
Shen et al, 2016304 T2D139β-Glucan 3 g4.5↓ 0.21, P < .05NS, 0%NSCochrane
3/4 high quality
He et al, 2016314 T2D229β-Glucan 3.5 g5.5↓ 0.22, NSP < .001, 92%
HbA1c%, glycosylated hemoglobin percentage;
NOS, Newcastle-Ottawa Scale;
NR, not reported;
NS, not significant;
T2D, participants with type 2 diabetes only.

aLow-quality score on the Critical Appraisal Checklist for Systematic Review.