Perhaps it's unquantifiable. Or maybe we are looking at the term "balance" too narrowly. If I eat balanced diet, that doesn't mean I eat terrible foods 50% of the time, it means I eat a healthy balance of all the things my body needs. The word balance has almost a dozen definitions, but the main ones are: bal·ance ˈbaləns/ noun 1. an even distribution of weight enabling someone or something to remain upright and steady. "slipping in the mud but keeping their balance" synonyms: stability, equilibrium, steadiness, footing "I tripped and lost my balance" 2. a condition in which different elements are equal or in the correct proportions. "overseas investments can add balance to an investment portfolio" synonyms: fairness, justice, impartiality, evenhandedness, egalitarianism, equal opportunity; More verb 1. keep or put (something) in a steady position so that it does not fall. "a mug that she balanced on her knee" synonyms: steady, stabilize, poise, level "she balanced the book on her head" 2. offset or compare the value of (one thing) with another. "the cost of obtaining such information needs to be balanced against its benefits" synonyms: weigh, weigh up, compare, evaluate, consider, assess, appraise, judge "you need to balance cost against benefit"