Uncle Sam's and Fiber 1 are both low GI. However, if you are on Atkins Induction, neither are acceptable.
I'll try to answer your question about Shredded Wheat if you give me the nutritional content. I never buy it myself! It probably has to do with the relationship between the carbs and the fiber.
I hope this helps a bit.
Change isnít easy. But if you donít change, you stay the same, and whereís the fun in that?