I know I would like to know how many calories are in meals at places I go to. Sure, I could usually look it up on-line before I go for some places but how often will I do that? And many places don't offer that But when I go to Olive Garden or Outback I'd like to be able to have a menu that tells me exactly what it is I'm consuming.
Using government to help people empower themselves is, IMO, a legitimate use. It's when the government starts making those choices or pushing people one way or the other that bothers me.
We still like the FDA to make sure our meat is safe right? And to inspect the facilities food is processed/stored at right? There is little difference here.
This sort of regulation is something that should happen (and does) on the state and local level.
To quote the 10th ammendment:
“The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.”
It's really not their fault you forgot to bring your i-POD with you for an instant check.