Final answer:
Social isolation has not been found to produce positive health and well-being outcomes, while the other interventions listed have been found to have positive effects.
Step-by-step explanation:
Out of the options listed, Social isolation has been found to NOT produce positive health and/or well-being outcomes. The other interventions listed, such as Meditation, Regular exercise, Balanced diet, and Cognitive behavioral therapy, have all been found to have positive effects on health and well-being.