"ed rosenthal" wrote in message
news:MY2_b.375563$xy6.1937488@attbi_s02...
"The glycemic index is a ranking of carbohydrates based on their immediate
effect on blood glucose (blood sugar) levels.

It is not really a "ranking." It is a percentage. There are two scales
used:
glucose and white bread.

For the glucose scale, volunteers are given 50 grams of glucose to consume.
Blood sugar response is plotted over time and the value calculated is set
to 100. Other foods are tested and the GI is a comparison of that food to
glucose. A baked potato with a GI of 90 means that the potato causes
a blood sugar response that is equal to 90% of the response to pure glucose.
Whole milk has a GI of 27 -- 27% of the effect of pure glucose. White bread
generates a blood glucose response equal to 70% of the effect of pure
glucose.

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