a balance should just tell the weight and nothing more 
Smart Scale P1 Launch
A balance has to tell you what to eat, what to drink, when you have to go to sleep…
And if you don’t obey …
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ha ha if you don’t obey then it will harass you till you obey
I remember a very old SF-story:
“The iron chancellor” from Robert Silverberg"
Think this was published about 1958.
You might google for this book.
Great fun, but so visionary!