The Word of Wisdom (see Doctrine and Covenants 89) is a law of health for the physical and spiritual benefit of God’s children. It includes instruction about what foods are good for us and those substances to avoid.

Over time, Church leaders have provided additional instruction on those things that are encouraged or forbidden by the Word of Wisdom, and have taught that substances that are destructive, habit-forming or addictive should be avoided.

The article “Vaping, Coffee, Tea, and Marijuana” in the August 2019 issue of the New Era magazine states the following:

The word coffee isn’t always in the name of coffee drinks. So, before you try what you think is just some new milkshake flavor, here are a couple of rules of thumb: (1) If you’re in a coffee shop (or any other shop that’s well-known for its coffee), the drink you’re ordering probably has coffee in it, so either never buy drinks at coffee shops or always ask if there’s coffee in it. (2) Drinks with names that include café or caffé, mocha, latte, espresso, or anything ending in -ccino are coffee and are against the Word of Wisdom.

Church leaders followed up with an official Statement on the Word of Wisdom, clarifying that coffee-based products are prohibited by the Word of Wisdom.

Also see the section “Word of Wisdom and Healthy Practices” in the Church’s General Handbook (section 38.7.14).