If you can see the role Brain C 13 stress plays in relationship to increased mental health challenges, then the contrary, the practice of stress management, can lead to reduced demonstrations of symptoms. Forms of stress management, biofeedback, "desensitization," "mindfulness," and other anxiety reducing practices (like yoga, meditation, diet, exercise, etc) can prove very therapeutic in helping to control the causes of anxiety/stress related symptoms.
Beyond symptom control, for the motivated client, I feel that using these techniques until mastered and then regularly, and preventively, can benefit a person by "empowering" them with body awareness, present living mindfulness, and new skills to control stressed out physiologies.
Empowerment of the individual is the key! Self-awareness and then self-control (of habitually held stress) enables a person to feel better in control of available time and energy and better able to self-minimize, if not eliminate, psychological symptoms and emotional/spiritual pain & conflict. Spending time in a "positive" way, in the present moment, leads to reduced fear and anxiety.