From everything I have read, it is certainly recommended.
I do not typically drink reg coffee, opting for 1 cup of decaf a day.
I also drink decaffinated soda's if I am having one (maybe 1 a week) but mainly I drink water. So much so, my dh bought me a water cooler for Christmas.
I limit my sugar intake, but do treat myself. In moderate amounts it does not bother me. Usually once a week I eat a dessert or something.
But also don't forget that we tend to talk ourselves into things, so if you have one piece of chocolate and you think it will make you more anxious there is a good chance it will.