Although diet has not been heralded as a form of treatment, it is certainly intuitive that it would play a significant role in depression. Interestingly the very things you crave may exacerbate your depression. This article has an interesting comparison of a change in diet versus social change, and their role in depression.

https://www.drperlmutter.com/diet-and-depression-an-updated-perspective/

Needless to say depression and sleep are intertwined, and that diet would influence both makes total sense. However, the conclusions may surprise you.

https://www.nytimes.com/2020/12/10/well/eat/sleep-foods-diet.html?referringSource=articleShare