Hmm actually it might preserve the body somewhat depending on the chemicals... but i dont think those chemicals are really for eating... not that most of the chemicals that go into food really are...
certain chemicals do. its been a practice for centuries. but of course none of the chems found in food can preserve your body. well actually it might depending on the combinations of what chemicals would be found. otherwise if anything it would cause the body to rapidly decompose.
truth is relative. a certain information can be a lie, a truth or both. In history, the previously accepted truth was the earth was flat, this was later proven to be a lie. The only difference between a truth and a lie is that the former is believed by the majority. but the case is, they are both just information.
as they say in Assassin's Creed "Nothing is true, everything is permitted"