Study: https://www.neurology.org/doi/10.1212/WNL.0000000000214023
From the abstract:
> Consumption of aspartame, saccharin, acesulfame k, erythritol, sorbitol, and xylitol was associated with a faster decline in global cognition, particularly in memory and verbal fluency domains.
These findings do NOT apply to tagatose, stevia, or mogroside.