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Making Sense of the Glycemic Index

The glycemic index (GI) ranks carbohydrate foods based on how quickly the body turns them into glucose (blood sugar), provoking an insulin response.

| November/December 2013

  • Photo By Thomas Gibson

The glycemic index (GI) ranks carbohydrate foods based on how quickly the body turns them into glucose (blood sugar), provoking an insulin response. Grains in their natural form have a low GI, while processed carbohydrates, especially those made with flour or puffed grains, have a higher GI. The reason is that it takes longer for digestive enzymes to reach the starch inside whole grains or grains cracked into large pieces, slowing down the conversion of starch to sugar. Pulverized grains have a tremendous surface area for enzymes to work on. This leads to quick starch-sugar conversions that spike blood sugar levels, creating dips later on that can prompt more consumption of pulverized grains—and the cycle continues.

Whole wheat bread and products labeled “whole grain” are usually made with pulverized grains (flour) rather than whole or cracked grains. For that reason, most whole wheat bread has the same high GI ranking as white bread—about 70. I recommend cutting down on all foods made with flour and increasing consumption of grains in their more natural state such as wild rice, barley, quinoa, millet and wheat berries.

When using the glycemic index, be sure to consider “glycemic load,” which takes account of how many grams of carbohydrate a normal serving contains. For example, carrots rank high on the glycemic index, but the amount of carbohydrates you would actually consume in a normal serving is pretty low; only 6.2 grams. Don’t avoid carrots (or beets) based on their GI rankings. Unless you eat huge portions, these vegetables will not disturb your blood sugar very much, and they provide important phytonutrients.

Pasta is also a special case. When it is cooked al dente (that is, until barely tender) and eaten in moderation, it does not present the body with a high glycemic load because the pulverized grain comes apart slowly in the stomach. Dark chocolate is also OK because it is low in sugar.

While the concept of glycemic load is helpful, doing calculations for everything you eat isn’t practical. Simply reduce your consumption of processed and refined foods, such as processed snack foods, white bread, sweetened drinks and sugary desserts. Eat more sweet potatoes and fewer white potatoes, less bread (unless it’s really chewy and grainy), more whole grains and fewer products made with flour, more beans, and more temperate fruits (especially berries, cherries, apples and pears) and fewer tropical ones.

To learn more about all this, I recommend reading The New Glucose Revolution: The Authoritative Guide to the Glycemic Index by Thomas M.S. Wolever., Jennie Brand-Miller, Stephen Colagiuri and Kaye Foster-Powell. For more on sugar and how it affects our bodies, read the original article, All About Sugar.

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