I think it is a great idea, and that is speaking as one fairly savvy with diet, exercise etc.,
I know, that personally, if I picked up a luscious looking cheesecake at the supermarket, the calorific count is a big ouch. BUT, reading a label that says eating 25% of this cheesecake will take thirteen hours of walking to burn off, it really drives it home.
I would not get overly hung up on male v female rates either, it is an indication, nothing more, but an easily understandable indication.