Diet Coke will dehydrate you
The Influence of Diet Cola on a Low Carbohydrate Diet
As the link you provided mentioned earlier, diet drinks can stay sweet because of the artificial sweeteners. The same artificial sweeteners are also used in many dietary foods (see Walden Farms products). However, there are differences in how bad the different sweeteners are or how much we know about their long-term effects.
As the Yahoo response hinted at, aspartame is one of the products that we know to have bad properties. The “en vogue” sweeteners like Splenda (sucralose) and stevia are “less bad” than aspartame. That doesn't mean they're great too. I recommend reading the Mayo Clinic article on artificial sweeteners for an overview.
My weight loss center was totally against diet sodas because they made your body more acidic and, as a result, more prone to disease. I'm not sure if this claim was pseudoscience or not, but the Self Nutrition Data Site has an Inflammation Index that measures the same concept. According to the data there, Diet Coke and Diet Pepsi have no influence on the inflammation index.
Diet drinks and most sodas, coffee, and tea contain caffeine. Caffeine is a diuretic when consumed in large enough quantities. Combined with the sodium content (see next paragraph), you may be more thirsty after drinking the soda than you were before. Many people drink diet sodas in sufficient quantities to become a diuretic.
The last potentially bad thing about excess diet sodas is the sodium content. Coke Zero appears to be quite low in sodium (30 mg / 8 ounce product) compared to Diet Coke (40 mg / 8 ounce product). That said. Most people drink large amounts of it, with serving sizes ranging from 16 to 48 ounces of soda. The sodium content at this point becomes a significant amount to worry about. High levels of sodium are linked to high blood pressure and water retention.
At the end of the day, water is still the ultimate diet drink. It helps you process protein better and doesn't make you dehydrated.
Someone drew my attention to a study that indicated that artificial sweeteners raise blood sugar more than regular sugar (ref). The proposed mechanism has to do with the artificial sweeteners that affect the intestinal microbial bacteria. The article was interesting read, but we can't rule out the last page that talks about the criticism of the study. The conclusion is well summarized in the article:
"We in no way believe that we are ready to make recommendations on the use and dosage of artificial sweeteners based on the results of this study," said Segal.
However, Elinav said her findings led him to stop using artificial sweeteners in his coffee.
He doesn't use sugar either. "I think we have to emphasize that we are by no means saying that sugary drinks are healthy," said Elinav. (quoted from article)
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