this is one of those "things". There very well might be flying saucers and big foot may be lurking behind every tree, there just isn't any good evidence of them. Aluminum might be unhealthy, but there isn't any evidence other than one study done in Canada that could not be replicated anywhere in the world. By the way: Titanium might be harmful, though I don't believe for a minute that it is. "Titanium compounds are considered physiologically inert. There is no reported cases in the literature where titanium as such being toxic." A quote from "Dangerous properties of industrial materials, by N.Irving Sax page 1033 (edited slightly by me, but no change in meaning).