According to Sudha Seshadri, a professor of neurology at Boston University School of Medicine (MED) and a faculty member at BU’s Alzheimer’s Disease Center, studies have linked excess consumption of both regular and diet soda with accelerated brain aging, smaller hippocampal volume, and poor memory. People who consumed more than two sugary drinks a day of any type (soda, fruit juice, and other soft drinks) or more than three per week of soda alone, showed signs of accelerated brain aging, including smaller overall brain volume, poorer episodic memory, and a shrunken hippocampus, all risk factors for early-stage Alzheimer’s disease. Researchers also found that higher intake of diet soda—at least one per day—was associated with smaller brain volume. (Pase, Mathew P., et al. “Sugary beverage intake and preclinical Alzheimer’s disease in the community.” Alzheimer’s & Dementia. Published online March 5 2017 doi: 10.1016/j.jalz.2017.01.024)