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From: David Högberg (
Subject:         Question about Glycemic Load
Date: November 15, 2013 at 6:44 am PST

Hi Doug! I have a question about Glycemic Load (GL).

In your book, The 80/10/10 Diet, you answer the argument that fruit generally has a high Glycemic Index (GI) by pointing out that while that is true, it has a very low GL, and that the GL is the important thing. I see this argument being made in favor of fruit all over the web by different people.

GL is a GI-weighted measure of carb content. In other words, it's a way of measuring carb content of a food while also taking into consideration the GI of the food. So, a food that has a high GI, but few calories, will get a low GL, and vice versa. Formally it's defined as grams of carbs multiplied by GI divided by 100.

So, to my point. Lets take for example water melon. It has a GI of around 70, but a GL of only 4. Now, this GL is calculated for a serving size of around 100 grams, which has about 6 grams of carbs. If we double the serving size to 200 g, the total amount of carb is doubled, and thus the GL doubles to around 8. Etc.

For an 80/10/10:er, a serving of 100 g water melon is ridiculous. Increasing the serving tenfold, to 1000 g, increases the GL tenfold, to around 40. This is by no means a low GL, while still quite a small meal!

Given this, the argument that fruit has a low GL is totally misleading.

So Doug, please tell me, am I missing something here?


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