ABSTRACT
Hyperglycemia and insulin resistance are independent risk factors for cardiovascular
disease (CVD). Postprandial glycemic “spikes” adversely affect vascular structure
and function via multiple mechanisms including oxidative stress, inflammation, low-density
lipoprotein oxidation, protein glycation, and procoagulant activity. Glycemic responses
can be reliably predicted by considering both the quantity and quality of carbohydrate.
The glycemic index (GI), a measure of carbohydrate quality, has provided insights
that knowledge of the sugar or starch content has not. In prospective observational
studies, dietary GI and/or glycemic load (GL; the product of the amount of carbohydrate
and GI) independently predict CVD, with relative risk ratios of 1.2 to 1.9 comparing
highest and lowest quartiles. In randomized controlled trials in overweight subjects,
diets based on low GI carbohydrates have decreased plasminogen activator inhibitor-1
activity and other CVD risk factors over and above that of conventional low-fat diets.
Taken together, the findings suggest that clinicians may be able to improve CVD outcomes
by recommending the judicious use of low GI/GL foods.
KEYWORDS
Glycemic index - cardiovascular disease - carbohydrates - glycemic load - postprandial
glycemia
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GIsymbol.com .
Available at: http://www.gisymbol.com.au
Accessed October 25, 2008;
Prof. J. Brand-Miller
Human Nutrition Unit (G08), University of Sydney, Camperdown
NSW 2006, Australia
Email: j.brandmiller@mmb.usyd.edu.au