I guess it's like all these different items. If you can use it without hitting a plateau, then great. I'm sure Splenda causes the occasional plateau as well.

I know that my wife, who a type II diabetic, has some trouble with her blood sugar levels on days that she drinks several aspartame sweetened beverages. But who knows maybe those are just stressful days for her anyway...But it has made her more concerned about limiting aspartame intake. Everything in moderation.