Kim Jinseok, Noh Jin-Won, Park Jumin, Kwon Young Dae
Department of Social Welfare, Seoul Women's University, Seoul, Korea.
Department of Healthcare Management, Eulji University, Seongnam, Korea.
PLoS One. 2014 Dec 11;9(12):e114891. doi: 10.1371/journal.pone.0114891. eCollection 2014.
There are conflicting results about the association between body mass index (BMI) and depressive symptoms in older adults. The present study examined the relationship between weight and depressive symptoms over time in older adults in South Korea.
We used data from three waves of the Korean Longitudinal Study of Aging and ran a series of cross-lagged panel models to test the reciprocal relationship between depressive symptoms and obesity in older Korean adults. We assumed a temporally stable relationship between depressive symptoms and obesity and, thus imposed equality constraints over time.
After controlling for the effect of depressive symptoms two years prior, underweight older adults had a higher depressive symptom score than those of normal weight. When controlling for obesity status from two years prior, older adults with higher levels of depressive symptoms were more likely to be underweight and less likely to be overweight than normal weight. The same patterns were observed in data from 2006 to 2008 and from 2008 to 2010.
These results show that there is a correlation between depressive symptoms and weight status. In middle-aged and elderly Asian populations, depression can lead to weight loss rather than obesity, and underweight may develop depressive symptoms.
关于老年人身体质量指数（BMI）与抑郁症状之间的关联，研究结果存在冲突。本研究调查了韩国老年人的体重与抑郁症状随时间的关系。
我们使用了韩国老年纵向研究三波的数据，并运行了一系列交叉滞后面板模型，以检验韩国老年成年人抑郁症状与肥胖之间的相互关系。我们假设抑郁症状与肥胖之间存在时间上稳定的关系，因此在时间上施加了平等约束。
在控制了两年前抑郁症状的影响后，体重过轻的老年人抑郁症状得分高于正常体重的老年人。在控制了两年前的肥胖状况后，抑郁症状水平较高的老年人比正常体重的老年人更有可能体重过轻，而超重的可能性更小。在2006年至2008年以及2008年至2010年的数据中也观察到了相同的模式。
这些结果表明，抑郁症状与体重状况之间存在相关性。在中老年亚洲人群中，抑郁会导致体重减轻而非肥胖，体重过轻可能会出现抑郁症状。
