Oni the yanks subtract there fibre from the carb amount therefore the only usable carbs are from the sugar, trust me when i say this, as crazy as it sounds ive reserched the fuck out of these bars, a bloke has put in a lawsuit saying there not what they say they are, and it aint going anywhere in court, even the owner of the compamy done individual testing of their products and wrote a letter to the Public too, if you want me to quote it i will and give links
In regard to an insulin spike, i personally used a blood glucose monitor, and it only rose a couple points, the only insulin response you will get is from the whey protein,
and one more thing, you cant eat just one, there too fucking good, put in microwave for 10 secs, holy fuckm thank me later