Happiness is about health of body and soul.
The sentence is intended to mean that "happiness is health of body and soul" or that "happiness consists in health of body and soul".
Does it mean so? Is "to be about" used in such sense?
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Yes, the sentence basically means that happiness is health of body and soul.
We use "be about something" to talk about the most basic or important aspect of something (Macmillan English dictionary).
So, happiness is about health of body and soul = the most basic and important part of happiness is health of body and soul.