Dr. Marion Ashton wrote an insightful book about mental health, A Mind at Ease. The diagnosis is holistic and the solution is biblical. The author wrote from a holistic trichotomy perspective:

Another matter which is of great importance if we are to avoid mental tension, is that we should have some understanding of our make-up, and of the laws which govern the healthy functioning of our bodies and minds.

It is not necessary to go into technicalities as regards the nature of man, but there are two things in particular which I believe we need to recognise in relation to this whole question of mental tension.

The first is that our bodies, our minds [souls] and our spirits (the spirit being the organ of God-consciousness), are very closely inter-related. We do all know in experience that our minds are affected by the condition of our bodies. When we are tired or sick, our minds are not as alert as when we are rested and well. When we are spiritually right our bodies are often quickened and helped and our minds renewed.

Although man has different parts he is a unity, and should be considered as a unity. This simply means that if I want to avoid mental tension, and enjoy real mental health, I shall treat seriously the matter of physical health and spiritual health, I shall be prepared to discipline my body, and I will be careful of my ordinary and of my spiritual diet, so that I am feeding both body and soul on those foods which will be most conducive to physical and spiritual health. -emphasis added

Dr. Marion Ashton
ch. 3 THE PREVENTION OF TENSION
https://www.overcomertrust.org.uk/drmaa.htm