One of the promises to those who obey the Word of Wisdom is that they "shall receive health in their navel and marrow to their bones." (Doctrine and Covenants 89:18.)
Elder James E. Faust, then of the Quorum of the Twelve, spoke of this promise in the context of spiritual health and healing when he addressed the April 1992 general conference.
"Marrow has long been a symbol of vibrant, healthful living," he said. "But in a day of life-saving bone marrow transplants, the phrase 'marrow to their bones' takes on an additional significance as a spiritual covenant. The promises for those who keep the Word of Wisdom continue. Those who observe this law "shall find wisdom and great treasures of knowledge, even hidden treasures; and shall run and not be weary, and shall walk and not faint.
"And I, the Lord, give unto them a promise, that the destroying angel shall pass by them, as the children of Israel, and not slay them' (Doctrine and Covenants 89:19-21)."