Drinking two or more diet sodas or diet fruit drinks a day resulted in a 30% greater risk for heart attack or stroke than rarely or never consuming these diet drinks, an eight-year observational study of nearly 60,000 women (average age 62) has found.

Theory: Diet sodas and diet fruit drinks (as well as the nondiet versions) have been linked to weight gain and metabolic syndrome, which raise risk for heart disease.

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