The quality of being healthful or promoting wellbeing; wholesomeness.
From 'healthsome' (health + -some) plus '-ness', forming an abstract noun; follows the pattern of 'wholesome' → 'wholesomeness'.
Stacking '-some' and '-ness' together creates words that are so cumbersome that 'wholeness' or 'healthiness' almost always win out—this illustrates how language naturally selects simpler, more efficient ways to express ideas!
Complete word intelligence in one call. Free tier — 50 lookups/day.