Calculating the GL figure

[rt567]

Hi

I've learnt how to calculate the GL figure, ie Gi x GL dived by 100 = result

for burgens soya/linseed bread its about 4.3. per slice which is 40 grams I think

So if I was to eat slices, would that equate to 8.6 and for 3 slices 12:9 etc/etc? Within reason course, plus what I have in the bread.

Otaibix calculation is about 8 GL per biscuit

Please help.

Thanks again

 

[phoenix]

Hi

I've learnt how to calculate the GL figure, ie Gi x GL dived by 100 = result

for burgens soya/linseed bread its about 4.3. per slice which is 40 grams I think

So if I was to eat slices, would that equate to 8.6 and for 3 slices 12:9 etc/etc? Within reason course, plus what I have in the bread.

Otaibix calculation is about 8 GL per biscuit

Please help.

Thanks again

To calculate the GL:
GL = (GI x the amount of carbohydrate in the portion of food ) divided by 100
The GI index has 2 varied results for Burgen soy/linseed bread (tested on 2 different occasions) but basically your calculation is right. )
Bürgen® Soy-Lin, kibbled soy and linseed loaf bread GI = 36 (serve size = 30, carbs per serving = 9 GL= 3)
Bürgen® Soy-Lin, kibbled soy (8%) and linseed (8%) loaf bread GI =52 (serve size = 30g , carbs per serving=9 GL= 4)
http://www.glycemicindex.com/index.php

Using a 40 gram serving Burgen would have 12g carb:

36 x 12g (carbs in 40g) /100 =4.2
52 x 12g (carbs in 40g)/100 =6.2
(so pragmatically it has a GL of about 5 for a 40g serving, and would be about 10 for an 80g serving etc)

By comparison many white breads , for a standard 30g serving, have a GL of 10 or more and a couple as high as 18. So in theory, you could eat 60g of Burgen or 30g of many white breads and they would have similar effects on glucose levels.

There are no GI figures for Oatibix so we can't calculate it's GL.

 

[rt567]

Hello
Many thanks for that.

Sorry for being a bit thick, but if I ate 4 slices of the bread in one session, would it be double the amount GL as you have posted.

RE the two figures, why is one lower and the other higher?

Thanks again.

 

[phoenix]

Hello
Many thanks for that.

Sorry for being a bit thick, but if I ate 4 slices of the bread in one session, would it be double the amount GL as you have posted.
Yes

RE the two figures, why is one lower and the other higher?
The GI data base contains the GIs obtained from several recognised laboratories , sometimes you will find that the same thing has been tested on different occasions with different results. The GI of 36 for the Burgen was the result of a test in 1997, the one of 52 was the result of a test in 2008.
There are several possible reasons for 2 different GIs for the same product.
1) When they test the GI they use only a small sample of people. If they test again it will be a different group of people so the results will differ because of individual differences (that's why it is probably better to look at the type of foods that have lower or higher GIs than one off results)
2) In the earlier days of testing (ie back in 1997), it is possible that testing was done slightly differently than today.
3) Sometimes the manufactures change the recipe slightly and that can alter the GI. (the biggest known example of this is Rice Krispies where they seem to have different recipes for different countries)

Thanks again.

 

[rt567]

Thanks again, very much appreciated.

Can anyone answer the quest about if I was to east twice the mentioned level in one session would that double the GL? If yes, sorry for being a bit thick.

 

[borofergie]

Thanks again, very much appreciated.

Can anyone answer the quest about if I was to east twice the mentioned level in one session would that double the GL? If yes, sorry for being a bit thick.

The GL would be doubled.
The Carbohydrate Contenst would be doubled
The GI would stay the same

 

[rt567]

Hiya,

At last, this makes sense - thanks!

I got confused with the GI levels remaining the same as I intially read a lot about GI's. This is why the GL is a better calculation to use.

I'm very clear on this now and will put myself to the test:

GI of Burgens soya/linseed brea is 36/52 X 12,carbs per slice/40 grams) dived by a 100 = average figure of just over 5.

Thanks again

 

[borofergie]

Hiya,

At last, this makes sense - thanks!

I got confused with the GI levels remaining the same as I intially read a lot about GI's. This is why the GL is a better calculation to use.

I'm very clear on this now and will put myself to the test:

GI of Burgens soya/linseed brea is 36/52 X 12,carbs per slice/40 grams) dived by a 100 = average figure of just over 5.

Thanks again

GI only depends on the food you are eating. A bucket of chocolate sauce has the same GI as a mouthfull. This is why Gi isn't a very good measure by itself, and you need to multiply it by the carbohydrate weight to get the GL.