I was a diet coke maniac for such a long time. MANY years.... I would get 2-3 Rt 44s from Sonic a day. After my discover of CKD stage 3 I stopped them. Not saying thoese were the cause of it...but I know it didnt help. I feel SO much better without the Diet sodas. Also they definitely made me crave sweets and carbs along with adding a gut.
Once and a while I dont think they hurt...but long term I believe they are not a good choice.