Matt.
Just looking around, it would seem that arrowroot is a little high on the GI index.
You could argue that as you usually use so little of it in a recipe, it may be permissible, but I’ve not enough iDiet knwoledge to give a definative ruling.
Furthemore, I think we’re moving away from giving food a green light or a red light on an individual food item basis, here.
Therefore letting people enjoy the discovery of what is low GI, for themselves and hoping that they want to share something.
When considering new foods and ingredients, I have always focused on the GI rating with an emphasis on it being low GI.
Thats my Rule of thumb.
Good luck with the whole thing though.
:-)