Empathize.
 If they believe they can reach new levels of happiness and health and that anyone (even if they don't carry a diagnosable illness) can grow, they will be more likely to try.
 Realize that it is crucial to continue the positive relationship with them, and that a key to this is mutual trust. Never repeat or gossip about personal information anyone has shared with you.
Do what you can to help and show concern by being non-judgmental and friendly.
Help them understand that one can seek treatment and education to improve and increase achievement.
Maintain confidentiality.
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