Just n = 1 as well, but I’ve been drinking around 3 litres of diet coke per day for the past 15-20 years and haven’t had any adverse physical effects.
Other than that, far, far better than regular coke, which should be banned for people under the age of 21.
That said - it's much easier to drink just water now. No caffeine headaches and such. Can't actually drink the caffeinated diet coke anymore - get sick from it. Super weird.
0: https://www.sciencedaily.com/releases/2014/10/141009154007.h...