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I don't know the answer to your question as I haven't cut out sweetners, but the powdered form of Splenda (sucralose) definitely raises my BG. It's not really surprising as it is full of maltodextrin and other carbs used as a bulking agent - it actually has a lot of carb in it. The liquid form of sucralose such as DaVinci sugar-free syrup and the tablet form of Splenda do not have the bulking agent and contain zero carb - these do not affect my BG at all. All polyols that I've tried e.g. xylitol, maltitol etc raise my BG by nearly as much as sugar (sucrose).
thats worrying that sweetner has stuff in it that effecively does the same as sugar?! And if they reduce inslin sensitivity like this, we'd all be better off using sugar - or having none of course!!!