What to do when a person loses the will to live?

This is an important research question. As the often bandied phrase
"there's no one size fits all approach" suggests it is not an easy
question to answer.

I would suggest that by the time it gets to the stage where a person
loses the will to live there's nothing that can be done, but I'm not
sure. As the other often bandied phrase suggests, "prevention is better
than"....getting to the point where this question needs to be answered.