1590s, "in equilibrium," past-participle adjective from balance (v.). In reference to meal, diet, etc., by 1908.
Entries linking to balanced
balance v.
1570s, "be equal with," from balance (n.). The meaning "serve as a counterpoise to" is from 1590s; that of "bring or keep in equilibrium" is from 1630s; that of "keep oneself in equilibrium" is from 1833. Of accounts, "settle by paying what remains due," from 1580s. Related: Balanced; balancing.