According to the Diathesis-stress Model, mental disorders may remain unexpressed until what occurs?

The Diathesis-stress Model posits that mental disorders can be understood as the result of the interaction between an individual's predisposition to develop a disorder (diathesis) and external stressors in their environment. According to this model, an individual may have a genetic or biological vulnerability, but this alone does not guarantee the development of a mental disorder. It is the combination of this underlying predisposition and the presence of significant environmental stressors that can trigger the onset of mental health issues.

When the right environmental stressors—such as trauma, significant life changes, or ongoing life difficulty—occur, they can lead to the expression of mental disorders that may have been latent or unexpressed in individuals with a diathesis. This underscores the importance of recognizing how external factors can influence mental health and highlights that simply having a genetic risk factor does not mean that a disorder will present itself without the accompanying stressors.

The other options do not align with the key components of the Diathesis-stress Model. While genetic predisposition and therapeutic interventions can play roles in mental health, they do not address the premise that stressors are necessary to trigger the expression of these vulnerabilities. Demographic changes may relate to broader trends but are not specifically relevant to the