I knew it was dodgy, aspartame always gives me a headache

Also causes memory lose.

For those that downvote because you didn't want to do so basic research. Here https://www.amenclinics.com/blog/can-diet-soda-increase-the-chances-of-dementia/#:~:text=Aspartame%20overstimulates%20neurotransmitters.,as%20learning%20and%20pain%20perception.

But again this is one source. There are others first heard about it from Reddit. But I also have first hand knowledge of the effects because my brother and father were heavy drinkers of the stuff and definitely effected their memories.