- budgiemomParticipantMarch 6, 2014 at 11:19 pmPost count: 17
If you wouldn’t mind clarifying this, I’d really appreciate it. When calculating the FP for a food not included in the charts, does the glycemic index vary based on portion size? Clearly the NC and DF would, but does the GI get adjusted too? I got a little confused when reading that section in the book. It looks like the GI is calculated based on 50g of the test food, but I am not sure if I am supposed to alter the value for GI somehow if I am not consuming 50g of the food. Sorry if the way I am writing this is confusing, but can you help?
Also, I seem to recall someone asking in the past what the FP of Trader Joe’s rice tortillas is, but I can’t find it now. Any idea?
AndyNorm RobillardKeymasterMarch 7, 2014 at 9:16 pmPost count: 447
Hi budgiemom, Good question. The glycemic index is fixed regardless of portion size. The 50 grams of carbs is just the amount they use for the test. And you’re right the NC and DF vary as expected with serving size.
I estimate one (57g) Trader Joe’s rice tortilla (the only one I can find nutritional facts for is the “brown” rice tortilla) as having an FP of 14 grams. Note: I used a conservative estimated glycemic index of 50 for the calculation since the rice used is likely not a high GI variety. That gave 12 grams. Then I added the two fiber grams.JaemeParticipantMarch 8, 2014 at 12:50 amPost count: 348
This would be a good job for an intern – research the FPs of various foods to put into an “FP Guide” that could go into an FP cookbook! I’d buy that book in a heartbeat! 🙂budgiemomParticipantMarch 8, 2014 at 3:05 amPost count: 17
Thanks Norm! Very helpful! Oh, and I would buy that book with the FP values too!!! Great idea!goddessrocksParticipantMarch 10, 2014 at 6:22 pmPost count: 30
Yes… that book would be enormously helpful… and we could all input categories..ie like for athletes and sports supplements….
thanks for all the participation and input…JaemeParticipantMarch 11, 2014 at 2:49 amPost count: 348
I have been looking up the GI of different nuts, and most listings show the GI’s as “0”, except for cashews (22) and peanuts (7). The cashews & peanuts match the GI’s listed in the FT book, but the other nuts do not. Why is there a difference?Norm RobillardKeymasterMarch 11, 2014 at 3:05 amPost count: 447
Interesting Jaeme. Do you have the source for that info? I am not aware of that data.JaemeParticipantMarch 12, 2014 at 4:25 amPost count: 348
Hi Norm – I just searched “Glycemic Index of Nuts” and found several sites. The numbers on several of the sites had most nuts at zero, but cashews & peanuts the same as the FT book. Another site had most nuts at 10, but cashews at 22 like the FT book. Here are two:
http://www.vitalhealthzone.com/nutrition/food-values/nuts.htmlNorm RobillardKeymasterMarch 12, 2014 at 12:05 pmPost count: 447
Jaeme, Thanks for the links. The link showing zero GI’s for nuts is, well, nuts. I see no reference for where they got their information and the zero GI values make no sense, given that many of the nuts mentioned have carbohydrate contents similar to peanuts and cashews which do have GI values based on actual testing.
The Vital Health Zone link actually lists GI values for a number of other nuts, but does not cite the source references. I wrote to the site administrators requesting this information and will post their response here when I receive it.
In the meantime, for other tree nuts, I would just assume a GI value of 22 from the one tree nut that has been tested, cashews.JaemeParticipantMarch 12, 2014 at 3:11 pmPost count: 348
Thanks Norm – the hardest part of the FT plan is getting the GI values of foods, which I am sure you encounter as well. Some sites use the Glycemic “Load” instead of “Index”, which is different, correct?JaemeParticipantMarch 12, 2014 at 3:15 pmPost count: 348
Hummus question – chickpeas/garbanzo beans are very high FP 27, but hummus is listed as low at FP 6. What changes the value in the hummus?Norm RobillardKeymasterMarch 12, 2014 at 3:30 pmPost count: 447
Yes Jaeme, It’s a challenge. Hopefully more GI values will be published in the future. Also, one food company has validated (against actual GI values) a test method for the lab that can estimate GI values, but so far, they have not been publishing results using the method.
A decent rule of thumb is to used a GI of 50 for any foods you don’t have an actual GI value for as most vegetables have GIs ranging from 40-60. That way, at least you will be counting half of the carbs towards FP. Some people assume a GI of zero which means they count all Net carbs grams towards FP, but that seems overly cautious to me. Don’t forget to add fiber and any added sugar alcohols to the final FP.JaemeParticipantMarch 21, 2014 at 3:07 pmPost count: 348
Coffee question – does anyone know if the flavored coffee beans (not the coffee flavor syrups) from the gourmet coffee shops have any measurable sugars/sugar alcohols? If so, is there enough in the finished brewed coffee to affect FPs? I have several bags of flavored beans that I used to grind myself in my “pre-LPR” days. Wondering if I can use them now in the FT diet?
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