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Pooled mean changes in hemoglobin A1c (HbA1c) level in response to a vegetarian diet. Differences in HbA1c levels following intervention with a vegetarian diet in clinical trials. Effects on HbA1c levels are depicted as squares; error bars indicate 95% CIs. Meta-analysis yielded a pooled estimate of –0.39% (–0.62 to –0.15), depicted as a black diamond. ADA, diets followed American Diabetic Association; CI, confidence interval.
