Mental health issues can certainly be prevented with the proper care since childhood. But it is important to keep in mind that many people are genetically predisposed to developing a mental illness. It’s based on the two-hit hypothesis: the first hit are the faulty genes and the second hit is an environmental stressor that makes your mind go overboard, resulting in the development of an illness.
via Can Mental Health Issues Be Prevented? — DSM (Defeating Stigma Mindfully)
HeartyPsych 
It’s helpful to keep in mind that we’re not totally in control of whether we develop a mental illness or not. Genetics (and often circumstances) are something that “happen” to us, and they are a key part of the picture too.
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Absolutely! Genetics does play an important part. And as this is something beyond our control, it becomes all the more important to adopt a healthy lifestyle to reduce the risk.
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