The Word of Wisdom, received by Joseph Smith in 1833, was originally framed as counsel rather than commandment and became a strict requirement in the early twentieth century — a change the church discusses openly. It prohibits alcohol, tobacco, coffee, and tea (with caffeinated soda a matter of long-running internal argument), and recommends grain, fruit in season, and sparing use of meat. Its practical effect is a visible marker of membership and, epidemiologically, unusually low rates of several diseases among observant Latter-day Saints.