I think most of us miss the main point of the Word of Wisdom...The warning is about conspiracy not physiology. The Lord is warning that in the last days men will conspire in various ways to seduce us into surrendering our agency. Substances will be the vehicle of conspiracy.
On the other hand, spiritual communication can be enhanced by good health practices. Exercise, reasonable amounts of sleep, and good eating habits increase our capacity to receive and understand revelation. We will live for our appointed life span. However, we can improve both the quality of our service and our well-being by making careful, appropriate choices.