Is it legal for a franchise restaurant to withold nutrition information?

I know a restaurant chain who repeatedly refuses to provide nutritional information when asked. For years, this company has given everyone the runaround. Being a franchise owner myself, I was told that I must have nutrition information about our food available upon request. My question is whether or not it is legal for a fast-food franchise to repeatedly refuse to provide nutritional values for their products. Who regulates this kind of thing? To whose attention should this be brought? It is a national chain, not some local mom-and-pop store.

No this is not Legal I work in a restaurant chain and we MUST provide any customer who asks for it nutritional information. If this is a chain then I suggest you call head office and speak to someone higher up on the ladder.