[jvandreae]

That article seems a bit misleading. While some sweetener packets, such as equal and splenda contain some sugar, I don't believe this is necessarily true when they are used in other products. A quick google implies that, for example, Diet Coke (my beloved) does not contain any real sugar, only aspartame. So it seems disingenuous to compare the metabolic impact of a sugar/aspartame blend to pure aspartame.

[david-gpu]

The article goes into a lot more depth than that and contains links to the peer-reviewed research that it is summarizing.