While it is not recommended to drink coffee while on a liquid-only diet (black coffee on an empty stomach may cause gastric irritation in some people) if you are a die hard coffee junkie we don't recommend you going off of coffee cold turkey either! We don't want any of those negative side effects that can come with caffeine-withdrawal, so feel free to drink it. Additionally, our Vibrance juice has green tea which gives you a nice boost of caffeine and was specifically formulated with our coffee drinkers in mind.