Abstract：Depressive symptoms are significantly more prevalent among cancer patients representing one of the most common
psychological disorders in this population. These symptoms often diminish patients' enthusiasm for treatment thereby weakening the
effectiveness of their care and posing obstacles to their clinical recovery which adversely affects their prognosis. This article aims to
analyze the current epidemiological characteristics of depression in cancer patients comprehensively and systematically identify the risk
factors closely associated with it. This article examines how various dietary patterns and specific nutrients subtly influence depressive
symptoms highlighting the critical role of nutritional intervention in the prevention and alleviation of depression. Through scientific
demonstration we emphasize the considerable potential of optimizing dietary structures and rationally supplementing nutrients as
non-pharmacological therapies to enhance patients' psychological well-being and improve their quality of life. Additionally this article
proposes several prospective directions for future research aiming to bridge existing knowledge gaps foster the cross-integration of
nutrition psychology oncology and other disciplines and explore more precise and effective strategies for clinical depression
management. In summary this article serves not only as an in-depth review of depressive symptoms in cancer patients but also as a
strong advocacy for the potential application of nutritional therapy within the realm of mental health. It is hoped that this work will
contribute valuable insights and support to promote the overall health of cancer patients.
