I do low carb but I'm too lazy to accurately figure out my net carbs because when I started low carbing I noticed that some foods seemed "to good to be true" when I totaled the net carb grams.
I researched it and realized "sugar alcohol" was misleading when trying to calculate net carbs.
Sugar alcohol = non digestive carbs = 0 calories? (or a minimal ".0something" at best) Only 2 actually have a GI of 0. Maltitol Syrup was a 52 GI and in a lot of foods labeled low carb.
Comparison of Sugar and Sugar Alcohols
Sucrose(sugar) 100% 60 4
Maltitol Syrup 75% 52 3
Hydrogenated Starch Hydrolysate 33% 39 2.8
Maltitol 75% 36 2.7
Xylitol 100% 13 2.5
Isomalt 55% 9 2.1
Sorbitol 60% 9 2.5
Lactitol 35% 6 2
Mannitol 60% 0 1.5
Erythritol 70% 0 0.2
Just about every site had the same advice for figuring out your net carbs. Only subtract fiber.
I wanted to see what the difference was by tracking the specific sugar alcohols and checking to see if the product was using the North American label system, not the European one which list the net carbs under the regular carbs.
My net carb total was about 20g higher then I thought. My total carb % was actually more accurate.
My pancake syrup actually had 9 net carbs, not zero like the label made you think.
My low carb tortillas already had the net carbs subtracted in the total carb but it didn't say it anywhere on the label. I found out after I googled several sites.
I may be misunderstanding the whole net carb thing but as long as I am in the 60-80g total carb range I don't bother subtracting the net or the fiber because sometimes they already did that on the label.