Fact learned today via Alex: Mormons are forbidden to drink coffee! More specifically,
hot drinks.
In 1833, Church prophet Joseph Smith received a revelation from God regarding health, known as the Word of Wisdom. This revelation advises which foods and drink are good for the body and which substances should be avoided. It lists "hot drinks" as one of the harmful substances, saying they are "not for the body or belly." (see Doctrine and Covenants 89:9) Church leaders have explained "hot drinks," means both coffee and tea (excluding herbal teas).
You’d think this would mean iced coffee would be OK,
but no.
That article says that 35% of Mormons drink coffee anyway, so I guess reaching the highest levels of Mormonism aren’t really worth it for a lot of people.