This is a question I've never really asked myself. However, recently there was a study done suggesting an association between diet soda consumption and increased risk of heart disease and death.
While this may sound kind of scary, the word "association" is the one to pay attention to. Researchers found that a significant number of women who consumed diet soda were at increased risk for heart disease and/or death. The thing to note, however, is that there is no direct connection found between diet soda and heart disease; it's more likely an additional factor that is lumped in with other poor dietary choices.
In fact, researchers reported that the intake of diet soda is likely related to making up for other dietary indiscretions, AKA - getting the Big Mac with a diet soda, etc. Researchers found that "women who drank the most diet drinks were also more likely to smoke, to be overweight, to have diabetes and to have high blood pressure."
So while there is no reason to ban diet soda from your diet, it is important to consume it in moderation, just like any calorie-filled food. This is just another example of how eating a healthy, well balanced diet, even with the consumption of diet drinks occasionally, are so important in reducing your risk for heart disease and diabetes.
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