I guess it all depends on your definition of credible. I'm assuming you don't trust anecdotal.

http://www.askdrhull.com/forum/viewtopic.php?id=953


I guess it can be Big Sugar vs. Big Pharma

http://www.consumeraffairs.com/news0...nda_study.html

A new Duke University study finds that the artificial sweetener Splenda contributes to obesity, destroys beneficial inteestinal bacteria and may interfere with absorption of prescription drugs.

Read more: http://www.consumeraffairs.com/news0...#ixzz10mPFvHLE

http://stason.org/articles/wellbeing...-Pressure.html
...Avoid any artificial sweeteners like aspartame, neotame, saccharin, cyclamate, acesuflame-K and sucralose sold as Splenda found in most pop drinks and even in bottled water, food and sugar-free chewing gum and large amounts can elevate blood pressure...