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Researchers find glycemic index effective in composite meals
June 26, 2006Researchers in the University of Toronto's Department of Nutritional Sciences have some reassurance for diabetics and carb-counters. The glycemic index (GI), the table that lists the quality of carbohydrates in more than 750 common foods, works just as predictably whether subjects consume a single portion of one item, or a normal meal.
The GI was developed 25 years ago at U of T by Professors Thomas Wolever and David Jenkins. The table has become an important tool for the management of non-insulin diabetes and a reference point for popular carbohydrate-reducing diets. Carbohydrates are converted to glucose in the bloodstream and blood glucose levels are key indicators. Recent criticism of the GI has focused on unpredictable outcomes of blood glucose values in meals because of variations in fat, protein and fibre levels.
"The good news it that the GI index works" says Wolever. "For sensible people it makes a lot of sense. It's simple proportional measure—like mixing paint."
Concerned about the methodology of recent studies done elsewhere showing unpredictable responses, Wolver and his associate, Professor Jennie Brand-Miller of the University of Sydney, Australia, each conducted studies on two groups of healthy subjects. Fourteen different test meals were used in Sydney and Toronto, and the food combinations reflected typical breakfast choices such as juice, bagels and cream cheese, etc. Despite the variations in food, blood glucose responses remained consistent with GI measures.
"We had previously done much smaller studies. We revisited the question, using more meals and variety in two different centres with judiciously selected foods. I was startled by the degree of predictability," says Wolever. "The carbohydrate, fat and protein composition of the meals varied over a wide spectrum. The glucose responses varied over a five-fold range range, and 90 per cent of the variation was explained by the amount of carbohydrate in the meal and the GI values of the foods as given in published GI tables. The concept works." The results are published in the June issue of the American Journal of Clinical Nutrition.
The Canadian Diabetes Association affirms the value of the GI. "We definitely feel it's an invaluable tool in helping manage blood glucose and recommend it for diabetes education," says Sharon Zeiler, senior manager, nutrition initiatives and strategies. The basic principles of the GI are also applicable to a range of conditions, ranging from mood and memory to cardiovascular health and weight management.
University of Toronto
Concerned about the methodology of recent studies done elsewhere showing unpredictable responses, Wolver and his associate, Professor Jennie Brand-Miller of the University of Sydney, Australia, each conducted studies on two groups of healthy subjects. Fourteen different test meals were used in Sydney and Toronto, and the food combinations reflected typical breakfast choices such as juice, bagels and cream cheese, etc. Despite the variations in food, blood glucose responses remained consistent with GI measures.
"We had previously done much smaller studies. We revisited the question, using more meals and variety in two different centres with judiciously selected foods. I was startled by the degree of predictability," says Wolever. "The carbohydrate, fat and protein composition of the meals varied over a wide spectrum. The glucose responses varied over a five-fold range range, and 90 per cent of the variation was explained by the amount of carbohydrate in the meal and the GI values of the foods as given in published GI tables. The concept works." The results are published in the June issue of the American Journal of Clinical Nutrition.
The Canadian Diabetes Association affirms the value of the GI. "We definitely feel it's an invaluable tool in helping manage blood glucose and recommend it for diabetes education," says Sharon Zeiler, senior manager, nutrition initiatives and strategies. The basic principles of the GI are also applicable to a range of conditions, ranging from mood and memory to cardiovascular health and weight management.
University of Toronto
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'Bad Carbs' Not the Enemy, U.Va. Professor Says
The latest common wisdom on carbohydrates claims that eating so-called "bad" carbohydrates will make you fat, but University of Virginia professor Glenn Gaesser says, "that's just nonsense." Eating sandwiches with white bread, or an occasional doughnut, isn't going to kill you, or necessarily even lead to obesity, he said.
Glycemic index values are variable, report researchers
In work investigating the reproducibility of glycemic index values, researchers at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University (USDA HNRCA) have reported that multiple glycemic index value determinations (measure of the rate of glucose absorption into the bloodstream) using a simple test food, white bread, resulted in a relatively high level of inter-individual (among different individuals), and intra-individual (within the same individual) variability.
Right breakfast bread keeps blood sugar in check all day
If you eat the right grains for breakfast, such as whole-grain barley or rye, the regulation of your blood sugar is facilitated after breakfast, lunch, and dinner.
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