Should business also care about their employee's diets and fitness regimes? There are things that are outside of the purview of a business and the healthcare of their employees, outside of the direct impact of the business's work environment on the employee's health, should not be part of it.
Another way to say it, there is more to health than how an employer affects a person's life, and those things are none of the business' business.
Yes, businesses would be better off if they cared about wellbeing to such a degree. That doesn't mean control employees, though.
It means to actually care about the quality of food the employees have access to and the quality of culture surrounding them. It means caring about the environments people live in. It means recognizing people LEARN to make harming choices through harm (individual, familial, social, collective, cultural, systemic...etc) so recognizing repair is needed & pursuing that. This is what lobbying would be about without dehumanization.
Don't get lost in the fascist fantasies of what it means to care.
I don't want my employer to be involved in any of that though. Otherwise we'll be having a lot more conversations with people who are completely unqualified to make any determinations about things like my mental health.
Another way to say it, there is more to health than how an employer affects a person's life, and those things are none of the business' business.