Kudos to Mark Bittan for his post "Is a Diet Pepsi a Smart Choice?" The question refers to the new corporate sponsored "Smart Choice" labeling scheme. As he points out - it may be good compared to regular Pepsi (Just like how Froot Loops is a smart choice compared to a doughnut). And if aspartame's a problem, then it's not even that good. But how about Diet Pepsi compared to water? Duhhh.
And about that aspartame, let me remind you about the LA Times recent revelation that artificial sweeteners don't fool your brain, and in fact they may make you eat MORE. From the LA Times: "artificial sweeteners may turn on brain areas that create appetite, but not provide satiation."