Despite what was reported, the Church revelation spelling out health practices (Doctrine and Covenants 89) does not mention the use of caffeine. The Church’s health guidelines prohibit alcoholic drinks, smoking or chewing of tobacco, and “hot drinks” — taught by Church leaders to refer specifically to tea and coffee.

LDS Newsroom

http://www.mormonnewsroom.org/article/mormonism-news--getting-it-right-august-29