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American Journal of Clinical Nutrition, Vol. 87, No. 3, 627-637, March 2008
© 2008 American Society for Nutrition

ORIGINAL RESEARCH COMMUNICATION

Glycemic index, glycemic load, and chronic disease risk—a meta-analysis of observational studies1,2

Alan W Barclay, Peter Petocz, Joanna McMillan-Price, Victoria M Flood, Tania Prvan, Paul Mitchell and Jennie C Brand-Miller

1 From the Human Nutrition Unit, University of Sydney, Sydney, Australia (AWB, JM-P, VMF, and JCB-M); the Department of Statistics, Macquarie University, Sydney, Australia (PP and TP); the Department of Ophthalmology, Centre for Vision Research, Westmead Millennium Institute, Westmead Hospital, University of Sydney, Sydney, Australia (VMF and PM); and the NSW Centre for Public Health Nutrition, Human Nutrition Unit, University of Sydney, Sydney, Australia (VMF)

Background:Inconsistent findings from observational studies have prolonged the controversy over the effects of dietary glycemic index (GI) and glycemic load (GL) on the risk of certain chronic diseases.

Objective:The objective was to evaluate the association between GI, GL, and chronic disease risk with the use of meta-analysis techniques.

Design:A systematic review of published reports identified a total of 37 prospective cohort studies of GI and GL and chronic disease risk. Studies were stratified further according to the validity of the tools used to assess dietary intake. Rate ratios (RRs) were estimated in a Cox proportional hazards model and combined by using a random-effects model.

Results:From 4 to 20 y of follow-up across studies, a total of 40 129 incident cases were identified. For the comparison between the highest and lowest quantiles of GI and GL, significant positive associations were found in fully adjusted models of validated studies for type 2 diabetes (GI RR = 1.40, 95% CI: 1.23, 1.59; GL RR = 1.27, 95% CI: 1.12, 1.45), coronary heart disease (GI RR = 1.25, 95% CI: 1.00, 1.56), gallbladder disease (GI RR = 1.26, 95% CI: 1.13, 1.40; GL RR = 1.41, 95% CI: 1.25, 1.60), breast cancer (GI RR = 1.08, 95% CI: 1.02, 1.16), and all diseases combined (GI RR = 1.14, 95% CI: 1.09, 1.19; GL RR = 1.09, 95% CI: 1.04, 1.15).

Conclusions:Low-GI and/or low-GL diets are independently associated with a reduced risk of certain chronic diseases. In diabetes and heart disease, the protection is comparable with that seen for whole grain and high fiber intakes. The findings support the hypothesis that higher postprandial glycemia is a universal mechanism for disease progression.

Key Words: Glycemic index • glycemic load • dietary carbohydrates • epidemiology




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