The collection arrives at a moment when public health systems face converging pressures: shifting demographic patterns, rising rates of metabolic disorders, and a growing burden of mental health conditions. Understanding how everyday behaviors influence the brain across the entire lifespan, the editors write, has become one of the most dynamic and critical areas of modern public health and clinical research. The fourteen contributing papers cover a strikingly broad terrain, from ultra-processed food consumption in young adults to square dancing among older adults, from ketamine-related appetite changes in treatment-resistant mood disorders to handgrip strength as a marker of dementia risk.

A central thread running through the collection is the relationship between diet quality and emotional wellbeing. According to the editorial, poor dietary habits and nutritional deficiencies contribute directly to emotional distress and cognitive decline. Several of the included studies reported that the consumption of highly processed foods, combined with a sedentary lifestyle, was associated with an increase in the severity of depressive symptoms in young adults. Conversely, eating sufficient amounts of fruits and vegetables and engaging in regular physical activity appeared together to protect against anxiety and depression, a pattern reported in work by Saintila and by Ren and colleagues.

The editorial also highlights the role of dietary diversity in cognitive aging. The preservation of cognitive function in older adults, the authors summarize, can be achieved through maintaining a high level of dietary diversity and consistent physical activity over time. In parallel, targeted nutritional interventions are described as promising clinical tools for managing depression in later life, an area addressed in work by Li and colleagues. These findings position the kitchen table, in effect, alongside the clinic as a site where mental health trajectories may be shaped.

Physical activity emerges in the collection not only as a mood protector but as a buffer against addiction. Among teenagers, the editorial reports, those who engage in physical activity show a lower likelihood of becoming addicted to mobile phones, with psychological resilience and loneliness serving as key modulating factors in that pathway, according to work by Ding and Liu. In older age, negative emotions were found to influence eating behaviors directly, with physical activity playing a mediating role in that pathway, as reported by Yue and colleagues. The editors frame the capacity for movement as a powerful protective factor against both psychological distress and addictive behaviors.

The subjective experience of exercise also receives attention. Emerging adults, the editorial notes, undergo mood shifts associated with physical activity and with their subjective exercise experiences, findings drawn from work by Shen and colleagues. Meanwhile, the administration of ketamine opens new perspectives on the appetite changes that occur during treatment of treatment-resistant mood disorders, a clinical question explored by Mechlińska and colleagues. Together, these studies illustrate how psychological mediators, such as resilience, loneliness, and perceived exercise experience, sit between behavior and mental health outcome, shaping whether physical activity translates into measurable benefit.

Among the most accessible interventions highlighted are mind-body practices. Dance, yoga, and tai chi are described as highly effective non-pharmacological treatments that simultaneously target biological dimensions such as metabolic health and sleep quality, psychological dimensions such as anxiety and depression, and social dimensions such as community connection and happiness, according to work summarized from Wang and colleagues. Research cited in the editorial showed that square dancing enhances social wellbeing and fosters cultural connections among older adults, while general dance interventions improved overall sleep quality. Social participation, the editors note, mediates the relationship between square dancing and wellbeing in older adults, a finding reported by Song and colleagues.

The scalability of these interventions is a recurring theme. The editorial emphasizes that dance and mind-body programs offer accessible, low-risk, and highly scalable solutions for diverse populations, ranging from people with severe psychiatric conditions such as schizophrenia to chronic disease survivors, including breast cancer patients, and aging populations seeking community connection. In one clinical application, physical activity was reported to help stabilize metabolic syndrome risk factors in patients with schizophrenia, work attributed to Wang and colleagues. These findings suggest that structured movement can be embedded across the spectrum of care, from community centers to psychiatric settings.

The collection also examines how physical and nutritional status combine to shape cognitive risk. The combination of physical weakness, measured as low handgrip strength, and obesity significantly increases the risk of cognitive impairment and dementia, according to work by Ramírez-Vélez and colleagues and Shen and colleagues. Body composition metrics, including body mass index, a body shape index, and handgrip strength, are described as acting both as physiological risk markers and as mediating markers for metabolic syndrome and dementia. In younger populations, the combination of body shape and cardiorespiratory fitness was found to influence executive brain function, a relationship reported by Bi and colleagues.

The editorial closes with a pointed conclusion: lifestyle interventions should no longer be treated as secondary, complementary advice. Nutrition, structured movement, social physical activities, and the preservation of muscle function are, in the editors’ framing, foundational, front-line medicine. To combat the rising global crises of mental illness, addiction, and dementia, the authors argue, healthcare systems must aggressively integrate lifestyle medicine into standard clinical practice. As an editorial overview of a diverse Research Topic, the piece synthesizes reported associations and intervention findings across populations rather than presenting a single trial result, and its conclusions reflect the collective weight of the fourteen studies it surveys.

Subject of Research: Synergistic effects of nutrition and physical activity on cognitive function and mental health

Article Title: Editorial: The synergistic effects of nutrition and physical activity on cognitive function and mental health

Article References: Kim, S., Kim, T.-W., & Kang, H. (2026). Editorial: The synergistic effects of nutrition and physical activity on cognitive function and mental health. Frontiers in Nutrition, 13, 2007529. https://doi.org/10.3389/fnut.2026.2007529

Image Credits: AI Generated

DOI: 10.3389/fnut.2026.2007529

Keywords: nutrition, physical activity, cognitive function, mental health, depression, dementia, mind-body interventions, dietary diversity, ultra-processed foods, dance, executive function, lifestyle medicine