Every so often I find myself wondering this. Not where it's seated in the government on paper- that's easily accessible info- but, who holds the purse strings to what parts of it. Figured there was a fair chance if I posted it here someone here would jump up and say "Ooh! Ooh! I know!" and jump in with an answer/links/etc.
Part of why I'm wondering at the moment is I don't really trust their health "guidelines" (as at some point I guess I turned into a conspiracy theorist?) and wonder what what the likely skews/biases are.