So...you want games to teach you a healthier way to live. I guess that you would like porn games to force monogamy onto the MC. In fact NO SEXUAL SITUATIONS until both the MC and the LI have been to the doctor and received a thorough and complete physical and STD tests. Have the MC in bed every night at 8:30pm sharp. No alcohol or drugs. Use condoms and/or birth control pills. Make sure that their diet is nutritionally sound, with no more than 1800 calories per day. They should work out at the gym regularly. Ride a bicycle everywhere. And they should probably also grow their own vegetables in order to guarantee that the "organic" produce that they eat is actually organic.
That sounds super fun and exciting! Dumbass.
How about teaching people to enjoy their lives, and NOT being a preachy little bitch? That seems like the ideal way to make a game, a book, a movie, an internet post, or pretty much anything.