This study looked at the correlation between nutritional status of older adults and health. Correlation was observed between quality of nutritional status and depressive symptoms. Elderly individuals who perceived that they had poorer health, were also observed to be at higher risk of depression.
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Jung, S. E., Bishop, A. J., Kim, M., Hermann, J., Kim, G., & Lawrence, J. (2017). Nutritional Status of Rural Older Adults Is Linked to Physical and Emotional Health. Journal of the Academy of Nutrition and Dietetics, 117(6)