Does it -- The word Of Wisdom -- still remain a stone in the foundation of LDSism?
Yep.
How does Current-day obesity fit into Latter-day teachings of what and how to eat?
Has revelation ceased in this matter?
It is not meet that the Lord should command in all things. The WoW is a model that tells us we need to watch what we ingest. There are some specific don'ts that are enforced. After that, you need to make your own decision and by those decisions, you will reap what you sow.