Clin Psychopharmacol Neurosci.  2021 May;19(2):361-366. 10.9758/cpn.2021.19.2.361.

Body Mass Index and Somatic Symptom Severity in Patients with Somatic Symptom Disorder: The Mediating Role of Working Memory

• Kim HJ
• Kim HR
• Jin JC
• Han DH
• Kim SM

• KMID: 2516188
• DOI: http://doi.org/10.9758/cpn.2021.19.2.361

Abstract

Objective
In somatic symptom disorder (SSD), cognitive dysfunction is related to perceptive distortion that excessively amplifies bodily sensations. The association between high body mass index (BMI) and cognitive dysfunction could be attributed to underlying systemic inflammation. We aimed to evaluate whether patients with SSD and high BMI exhibit increased somatic symptom severity and whether this is mediated by cognitive dysfunction.
Methods
This retrospective, cross-sectional study was conducted on 54 patients with SSD (20 males/34 females, mean age ± standard deviation: 40.65 ± 13.23 years). Participants’ BMI, laboratory data including complete blood count and lipid profile, results from the Korean Wechsler Adult Intelligence Scale-IV, and scores of the Korean-Symptom Checklist 95-Somatization (SCL95-SOM) were analyzed. We performed a path analysis to evaluate BMI as a predictor of somatic symptoms.
Results
In a path analysis, the SCL95-SOM score was directly influenced by working memory (b = −0.326, p = 0.032), which was significantly influenced by BMI (b = −0.338, p = 0.009), although there was no direct effect of BMI on the SCL95-SOM score. The path analytic model showed a close fit to the data with the following values: χ² (df) = 0.918 (1), p = 0.338, root mean square error of approximation = 0.000 (＜ 0.001), and comparative fit index = 1.00.
Conclusion
Patients with SSD and high BMI may exhibit increased somatic symptom severity, and this is mediated by working memory dysfunction. Weight management may help improve symptoms in patients with SSD and high BMI.

Keyword

Somatoform disorder; Body mass index; Working memory; Cognitive dysfunction