Weigh yourself often
and live accordingly,
and a long life
shall be given to you.

This old set of man-height scales can be found on the platform of Nollendorfplatz, one of Berlin's underground stations. I love the very old-fashioned look of it, it must have been there for a long time, maybe from before the war? The term "Knaben" for boys is certainly antiquated, and the weight lists are too I believe.