In life, you know, they do this in focus groups; if you were in such and such circumstance, what would you do? Well, you never know what you're going do unless you're faced with it.
For the sake of argument and illustration I will presume that certain articles of ordinary diet, however beneficial in youth, are prejudicial in advanced life, like beans to a horse, whose common ordinary food is hay and corn.
One movie I come back to time and again is 'The Hustler.' I don't think there's better dialogue in any film.