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Journal of Clinical Medicine Research

Original Article

Volume 12, Number 12, December 2020, pages 816-823

Association Between Psychological Distress and Stress-Related Symptoms and Increased Risk of Type 2 Diabetes in Male Individuals: An Observational Study

Environmental and lifestyle changes, as well as population aging, generally account for the rapid global increase in the prevalence and incidence of type 2 diabetes (T2D) in recent decades [1]. Apart from obesity and sedentary lifestyle, psychological stress represents an important risk factor for the accelerated incidence of T2D in high-risk populations [2-8]. The Japanese government launched a new occupational health policy called the Stress Check Program, which includes health checkups for psychological distress and stress-related symptoms [9, 10], the association between psychological distress using the Stress Check Program and increased risk of T2D. On the other hand, patients with T2D commonly experience stress-related symptoms such as irritation, fatigue, anxiety, and depression [11-15]. However, the association between stress-related symptoms and increased risk of T2D in the workplace is unknown. Therefore, this study aimed to evaluate the association between psychological distress and stress-related symptoms with the development of T2D in a cohort of male individuals.

This observational study recruited 6,326 individuals who participated in the Stress Check Program and received annual health checkups. According to the Japan Standard Industrial Classification by the Ministry of Internal Affairs and Communications (20 divisions), 38.1% of the participants were engaged in wholesale and rental trade, 29.9% in manufacturing, 12.5% in transport and postal services, 10.0% in government except elsewhere classified, and 9.5% in other divisions in the 99 collaborating companies and other industries. The inclusion criteria were male sex and age 18 - 65 years. Exclusion criteria were hemoglobin A1c (HbA1c) level ≥ 6.5%, previous history of diabetes, and use of diabetes medication. We did not exclude subjects who had undergone psychotherapy (either counseling or medications) at baseline. Baseline surveys were conducted from April 2016 to March 2017. The annual health checkups and stress check surveys were conducted on different days. Self-reported stress-related symptoms considered symptoms presented within the past month.

We evaluated the following anthropometric and biochemical variables: height, body weight, body mass index (BMI), blood pressure, HbA1c, high-density lipoprotein (HDL) cholesterol, and triglycerides. The self-administered questionnaire items on lifestyle behavior (smoking and exercise) were defined based on the definitions used for the Specific Health Checkup [16]. Diabetes was defined as a HbA1c level ≥ 6.5% or use of diabetes medication according to recent American Diabetes Association recommendations [17]. Questionnaire items on lifestyle habits were based on the standardized questionnaire used in the National Health Promotion Program [18, 19]. Psychological distress and stress-related symptoms were measured using the validated Brief Job Stress Questionnaire (BJSQ) [20], comprising 29 items assessing vigor (three items), anger-irritation (three items), fatigue (three items), anxiety (three items), depression (six items), and somatic symptoms (11 items). All items were measured on a 4-point Likert scale ranging from 1 (never) to 4 (almost always); points 1 and 2 received a score of 0, and points 3 and 4 received a score of 1. An individual was considered positive for depression when they scored at least 1 in each of the depression-related items. The BJSQ questionnaire items can measure six stress response scales; each item was developed based on previously standardized/authorized questionnaires. Specifically, “vigor,” “fatigue,” and “irritability” were based on the Profile of Mood States; “depression” was based on the Center for Epidemiologic Studies for Depression scale [21]; “anxiety” was based on the State-Trait Anxiety Inventory [22]; and “somatic stress responses” was based on the Screener for the Somatoform Disorders and the Subjective Well-being Inventory [23].

Data analysts were not blinded after the database was locked for final analysis. The Statistical Package for Social Science software version 24.0 (IBM SPSS Inc, Chicago, Illinois, USA) was used for all statistical analyses. Kaplan-Meier survival curves were compared by the generalized Wilcoxon test based on the depression status of the participants. The calculated hazard ratio (HR) was adjusted by age, BMI, and HbA1c (aHR), and is presented with its corresponding 95% confidence intervals (CI). Furthermore, we calculated the HR adjusted for confounding factors such as age, BMI, HbA1c, systolic blood pressure, triglycerides (TG) level, and exercise habits. Student’s t-test (or the Mann-Whitney U test according to the frequency distribution of the variable) was used to compare the means (or distributions) of the two study arms for continuous variables. The χ² test was used to compare the proportions of categorical variables. Relationships were analyzed using Spearman correlation coefficient. Missing values were deleted from the statistical analysis. A P value < 0.05 was considered statistically significant.

This study protocol was approved by the Ethics Committee of Hyogo Yobouigaku association (approval number H28-3), and was conducted in compliance with the ethical standards of the responsible institution on human subjects as well as with the Helsinki Declaration.

The baseline characteristics of the 6,326 participants included in the final analysis were as follows: mean age 47.4 ± 9.5 years, BMI 23.4 ± 3.4 kg/m², and HbA1c 5.5±0.3%. The average follow-up length was 1.9 ± 0.4 years, with a drop-out rate of 13.3% (Fig. 1). Over the study period, the incidence of new-onset T2D in the cohort participants was 2.0% (Table 1). Depression was associated with an increased risk of T2D (aHR = 1.54; 95% CI: 1.07 - 2.22), whereas vigor, irritation, fatigue, and anxiety were not associated with it (Table 2). In the depression assessment scale, scoring points on the items “I have been unable to handle work” (aHR = 2.18; 95% CI: 1.14 - 4.19) and “I have felt sad” (aHR = 1.93; 95% CI: 1.14 - 3.26) were associated with an increased risk of T2D (Table 3). Regarding stress-related symptoms, headache (aHR = 1.98; 95% CI: 1.18 - 3.34), shoulder stiffness (aHR = 1.56; 95% CI: 1.10 - 2.23), and constipation/diarrhea (aHR = 1.71; 95% CI: 1.04 - 2.80) were associated with an increased risk of T2D, whereas other symptoms did not show any association with it (Table 2). Depression was not associated with an increased risk of T2D in participants with fasting plasma glucose (FPG) ≥ 110 mg/dL (aHR = 1.71, 95% CI: 0.82 - 3.57) or FPG of < 110 mg/dL (aHR = 1.33, 95% CI: 0.49 - 3.55). The cumulative incidence of T2D was significantly higher in participants with depression than in those without depression (P = 0.037, Fig. 2). The cumulative incidence of T2D was significantly higher in participants with depression than in those without depression with HbA1c ≥ 5.7% (P = 0.010). However, the incidence was higher but not significant in participants with depression than in those without depression with HbA1c < 5.7% (P = 0.096). Depression was not associated with an increased risk of T2D (aHR = 1.50, 95% CI: 0.93 - 2.41) after adjusting for the confounding factors. Skipping breakfast correlated with the anger-irritability, fatigue, anxiety, and depression scores, but not with vigor. Late-night dinner eating also correlated with the anger-irritability, fatigue, anxiety, and depression scores, but not with vigor. Alcohol consumption habit did not correlate with psychological distress and depression (Table 4).

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Figure 1. STROBE flow-chart of participants. STROBE: Strengthening the Reporting of Observational Studies in Epidemiology; HbA1c: HbA1c: hemoglobin A1c.

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Table 1. Baseline Characteristics of the Study Participants

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Table 2. Adjusted Hazard Ratio for Developing Type 2 Diabetes

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Table 3. Adjusted Hazard Ratio for Developing Type 2 Diabetes According to the Depression Subscale

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Figure 2. Kaplan Meier plot of new-onset diabetes in participants based on depression status. Sixty-eight participants without depression at baseline were excluded from the analysis.

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Table 4. Correlation of Psychological Variables With Dietary Habits and Alcohol Consumption

This study demonstrated the association of depression symptoms, especially sadness and inability to handle work, with the development of diabetes. Increasing evidence indicates that depression and T2D share biological origins, particularly overactivation of innate immunity leading to a cytokine-mediated inflammatory response, and potential dysregulation of the hypothalamic-pituitary-adrenal axis [24]. Over time, these pathways can lead to insulin resistance, cardiovascular disease, depression, and increased risk of T2D [25]. Therefore, our results are consistent with previous studies.

In this study, we also found that sadness was associated with an increased risk of T2D. Although sadness is a normal emotional expression, it can be an indication of serious medical conditions that is easily missed by most clinicians [26]. Sadness was often identified as part of depression scales and as a predictor of cardiac events [27]. However, the mechanisms through which sadness affects the development of T2D are unknown. Sources of sadness are complex and multifactorial (e.g., biological, psychosocial, and environmental). Moreover, sadness and expressions of sadness have been linked to neuroanatomical and neurophysiologic functions, and have been associated with increased activity in the left amygdala and right temporal lobe [28]. Older adults often deny feeling sad while exhibiting other characteristics of depression [29]. Proinflammatory cytokines such as interleukin (IL)-1 are known to generate sadness, while daily happiness significantly predicted lower baseline and post-stress IL-6 after controlling for daily sadness in T2D [30, 31]. Low-grade inflammation was a significant cause of insulin resistance and beta cell failure [32]. Therefore, sadness may play an important role in the development of diabetes in the age group included in this study (18 - 65 years). Further studies including large samples are required to elucidate the association between sadness and the development of T2D.

Another depression-related factor, inability to handle work, was associated with an increased risk of T2D. Long working hours were associated with a higher risk of T2D [33]. The job demands-control model was associated with higher levels of blood pressure and serum lipids among the Japanese working population [34], but job control was not associated with a higher risk of developing T2D [35]. The reason behind the discrepancy between the results of this study and of previous studies is unknown. We hypothesize that differences in work conditions may partly explain the distinct results.

Stress-related symptoms, such as headache and shoulder stiffness, were also associated with T2D development. The relationship between headaches and the development of T2D is unknown. Patients with T2D experience changes in vascular reactivity and nerve conduction that may be relevant for migraine pathophysiology. These changes may also occur in individuals with prediabetes. However, previous studies on the relationship between headaches and T2D are contradictory [36]. Further studies employing a headache scale [37] are necessary to clarify this association. Furthermore, the prevalence of shoulder stiffness is increased in people with T2D [38].

Finally, we observed that bowel dysfunction symptoms, including diarrhea and constipation, were associated with an increased risk of developing T2D. Diabetes is associated with constipation, and poor glycemic control, diabetes duration, and BMI affect the risk of bowel dysfunction symptoms [39]. Although the exact mechanism of diabetic bowel dysfunction is unknown, autonomic nervous system dysfunction caused by hyperglycemia is hypothesized to influence colon motility.

We were unaware of the plausible reasons for job-related stress. Several job-stress models such as job-demand-control, effort-reward-imbalance, and organizational justice have been proposed [40]. Further examination including job-stress models is required to confirm these issues in the future.

In this study, skipping breakfast and late-night dinner eating correlated with depression scores. Skipping breakfast was associated with depression among adults with different socioeconomic factors [41]. Although the exact mechanism by which breakfast contributes to reducing depression and stress remains unclear, several mechanisms have been proposed. After breakfast, carbohydrates are converted into glucose, producing changes in the levels of acetylcholine, serotonin, tryptophan, and cortisol. Ingestion of carbohydrates is beneficial for the brain after night fasting as it reduces cortisol production, thereby decreasing the “stress” signal [42]. Overeating at dinner has been correlated to stress responses (e.g., fatigue, anxiety, and depression) in Japanese male workers [43]. Further examination including dietary interventions such as eating breakfast and reducing overeating at dinner are required to confirm these issues.

The longitudinal design and use of a validated scale for measuring depression and stress status were the main strengths of this study. Conversely, the main limitations were as follows: 1) The cohort used in this study originated from the Hyogo Prefecture in Japan, which may affect the generalizability of our results, especially for populations outside of Japan; 2) The measured outcomes were self-reported, which may incur some inaccuracy; 3) The follow-up period was short; 4) Occupational information, such as shift-worker, desk work, etc., was unknown; 5) Although a meta-analysis indicated an association between antidepressant use and incidence of diabetes [44], we did not collect antidepressant usage information in this study. To perform subgroup analysis, the sample size was small. These limitations should be considered when interpreting the results.

In conclusion, the findings of the current study indicated that depression and stress-related symptoms may increase the risk of developing T2D. Industrial physicians and health care providers should observe these factors during health checkups to potentially lower the incidence of T2D in this population.

Acknowledgments

We thank all the study investigators and staff and participants who participated in this study, for helpful discussions during manuscript development.

Financial Disclosure

This work was partly supported by JSPS KAKENHI (grant number: 18K01988).

Conflict of Interest

The authors have no conflicts of interest.

Informed Consent

All participants received a full explanation of the study protocol and provided informed consent.

Author Contributions

KT and NS conceived the ideas. KT analyzed the data. NS acquired the funding. KT, TK, and TY collected the data. NS and AS wrote the original draft. KT, TK, and TY reviewed and wrote the article.

Data Availability

The authors declare that data supporting the findings of this study are available within the article.

Abbreviations

BMI: body mass index; FPG: fasting plasma glucose; HDL-C: high-density lipoprotein cholesterol; T2D: type 2 diabetes

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