I would not contact them at all and don't try selling it to them ever, I would just build a nutrition site with it.
Put a statement at the bottom page, in small type stating you have nothing to do with them. That should cover you I would think, you should be able to make some money off a nutrition site easy. I like it for that infact, lots of people into that stuff for sure.
Edited IN: Remember .mobi makes you use a format standard, but you can get a site builder freeware programs with that standard. You'll want to read about it on the .mobi site, it's should not be hard and they will be inforcing the standard.