I'm with you on the diet soda. I need to cut back but I could never give it up completely. I also can't give up white bread completely. I eat whole grain the vast majority of the time but sometimes I still want sourdough.
Alcohol! I don't eat meat, I very rarely eat biscuits/cake/crisps (former crisp addict), I've cut back coffee to once a week if that and I limit dairy. All this obvs drives me to drink