Soda lovers won’t be sweet on these new health studies.

A pair of new reports drawn from the Framingham Heart Study (FHS) at Boston University Medical Center link sipping sugary drinks with poor memory and smaller brain volume. Worse, they tie a daily diet soda habit to a much higher risk of suffering stroke and dementia.

In the first study, researchers analyzed 4,000 people enrolled in the heart study over the age of 30, and used MRI scans and cognitive tests to measure any relationship between sweetened beverage intake and neurological health markers like brain volumes, thinking and memory. Americans swallowed 11 million metric tons of sugar last year, according to the U.S. Department of Agriculture, so lead author Matthew Pase and his team were curious about what the sweet stuff does to the brain.

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