Some, definitely not most. Often unhealthy lifestyle is the product of the underlying dysfunction rather than the other way around. People with chronic illness

Some, definitely not most. Often unhealthy lifestyle is the product of the underlying dysfunction rather than the other way around. People with chronic illness all have broken sleep(sleep disordered breathing), digestion(pathogenic gut microbiome), or other chronic illness(persistent virus presence is recently being associated with neurodegenerative disease, wouldn't surprise me if it caused mental health problems in earlier life)