Doesn't this type of work require a long-term investment?

Yes, there is an investment of your time and energy. If you want to make a change in your life you must be willing to take responsibility for yourself and be committed to what you desire. You choose what path the work takes and how long you wish to do the work.

Unhealthy behaviours also take your time and energy. Would you not rather invest your energy in living a more satisfying life?