study led by Ankur Vyas, MD, of the University of Iowa found that postmenopausal women who consumed two or more diet drinks a day were 30 percent more likely to experience a cardiovascular event and 50 percent more likely to die from related cardiovascular disease than women who never, or only rarely, consumed diet drinks. The analysis of 59,614 participants in the Women's Health Initiative Observational Study showed the difference persisted when researchers adjusted for other cardiovascular risk factors and co-morbidities.
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This is exactly what I mean when I say that there is confusion between cause, and association.

One might consider WHY a person might be consuming multiple diet drinks a day, or at all? Might it not be that they are obese? Is not obesity a well known cause of cardiovascular events?

I'll bet that those people wear pants that are larger than those of athletic people. Would it be reasonable to say that large pants are the cause of heart attacks?