‘Well being’ is not the opposite of ‘ill being’. Causes for one are not necessarily mirror images of causes for the other.
Evidence from:
CD Ryff et al. Psychother Psychosom (2006) Vol.75 p 85–95
“Psychological Well-Being and Ill-Being: Do They Have Distinct or Mirrored Biological Correlates?”
The problem is that duty of care will be established on the basis of linear logic: if x is a cause of stress then stop doing x or provide more of the opposite of x. The logic has been assumed rather than validated. This research shows the assumption is unsound in more ways than it was sound.
Further detail: