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Association between type 2 diabetes status and prevalence of liver steatosis and fibrosis among adults aged ≥ 40 years

BMC Endocrine Disorders volume 22, Article number: 128 (2022) Cite this article

Abstract

Background

Type 2 diabetes mellitus (T2DM) and non-alcoholic fatty liver disease frequently coexist and share pathophysiological manifestations. This study aimed to explore the association between T2DM status and prevalence of liver steatosis and fibrosis, identified using the controlled attenuation parameter and liver stiffness measurement attained via liver ultrasound transient elastography.

Methods

This was a cross-sectional analysis of data collected in the National Health and Nutrition Examination Survey for 2017–2018. Multivariable logistic regression model was used to evaluate the association between T2DM and prevalence of liver steatosis and fibrosis. Subgroup analyses, stratified by sex age, race, and body mass index (BMI), were further performed.

Results

Of the 2,780 participants aged ≥ 40 years enrolled, 749 had T2DM, and 2,031 did not. After adjustment for potential confounders, T2DM was associated with a higher prevalence of liver steatosis (OR = 1.7, 95% CI, 1.3–2.1). This T2DM-related prevalence was higher among women (OR = 1.8, 95% CI, 1.3–2.5) and in the non-Hispanic Black (OR = 1.8, 95% CI, 1.1–3.0), other race (OR = 1.9, 95% CI, 1.2–3.0), and BMI < 25 kg/m2 (OR = 2.0, 95% CI, 1.1–3.8) groups. T2DM was also associated with a significantly higher prevalence of fibrosis (OR = 2.0, 95% CI, 1.5–2.7), with this association being more prominent for the other race (OR = 2.9, 95% CI, 1.5–5.5) and BMI < 25 kg/m2 (OR = 3.3, 95% CI: 1.3–8.8) groups.

Conclusions

Our findings indicated a positive association between T2DM status and prevalence of hepatic steatosis and fibrosis. This association was more prominent for individuals with a BMI < 25 kg/m2 and was influenced by race-specific effects.

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Background

Non-alcoholic fatty liver disease (NAFLD) is the most common chronic liver disease and has become a major global health concern [1, 2]. In recent years, the prevalence of NAFLD has been rising progressively, along with type 2 diabetes mellitus (T2DM), which has reached epidemic levels [3]. T2DM is recognized as one of the strongest risk factors for the progression of NAFLD to non-alcoholic steatohepatitis, advanced fibrosis, or cirrhosis [4]. T2DM and NAFLD frequently coexist, with shared pathophysiological manifestations of excessive fat accumulation and insulin resistance [5].

The diagnosis of NAFLD is based on the detection of steatosis on liver biopsy and imaging techniques, after the exclusion of hepatic fatty infiltration and other causes of abnormal transaminase values via laboratory screening and medical history [6]. As a non-invasive imaging tool, liver ultrasound transient elastography (TE) provides excellent diagnostic accuracy for liver steatosis and advanced liver diseases in adults [7]. The latest cycle of the National Health and Nutrition Examination Survey (NHANES) includes liver ultrasound TE for the diagnosis of liver steatosis and advanced liver disease based on the controlled attenuation parameter (CAP) and liver stiffness measurement (LSM). Herein, we explored the association between T2DM status and prevalence of liver steatosis and fibrosis, indicated by the CAP and LSM, among adults aged ≥ 40 years using the NHANES database.

Methods

Study population

This cross-sectional study used data from the NHANES database (2017–2018 cycle). The NHANES is a program designed to provide objective health data of the population of the United States. The methodology and data collection for the NHANES are freely available (http://www.cdc.gov/nchs/nhanes.htm) and have been fully described [8]. Among 3,882 adults aged ≥ 40 years whose data were available in the database, the following were excluded: 441 for whom serum glucose or glycohemoglobin (HbA1c) data were unavailable; 234 without CAP or LSM data; 375 due to the presence of hepatitis B surface antigen, hepatitis C antibody, or a history of significant alcohol consumption (men: > 30 g/day; women: > 20 g/day) [9], 26 aged < 30 years at the time of diabetes mellitus (DM) onset; and 26 without body mass index (BMI) data. We included 2,780 participants in the final analysis.

The National Center for Health Statistics Research Ethics Review Board approved the survey protocol and all participants provided written informed consent for data collection and the use of their information for research.

Our study is compliant with the Guidelines for the STrengthening the Reporting of OBservational studies in Epidemiology (STROBE) guidelines [10].

Study variables

The exposure for our study is the T2DM status, defined according to the following criteria: participants being informed that they had DM by their doctor, age at time of DM diagnosis ≥ 30 years; and/or a HbA1c level ≥ 6.5% [11]. Outcomes on liver ultrasound TE were measured using a FibroScan® system (model 502, V2 Touch) and included CAP, with a value ≥ 274 dB/m indicative of liver steatosis [12], and LSM, with a median value ≥ 8 kPa indicative of significant fibrosis [13], provided by the liver ultrasound TE on a FibroScan® model 502 V2 Touch equipped with a medium or extra large probe. The following demographic and clinical variables were also collected as covariates in our analyses: age; sex; race; level of education; ratio of family income to poverty; level of moderate recreational activities; history of smoking ≥ 100 cigarettes; BMI; and blood urea nitrogen (BUN) levels, total cholesterol, uric acid, gamma-glutamyl transpeptidase (GGT), aspartic acid transferase, alanine amino transferase (ALT), alkaline phosphatase (ALP), and serum glucose.

Statistical analysis

All analyses were performed using statistical software R (version 3.4.3) and EmpowerStats (X&Y Solutions, Boston, MA), with a P-value < 0.05 considered significant. Multivariable logistic regression model was used to evaluate the association between T2DM status and prevalence of liver steatosis and fibrosis. Three statistical models were constructed: model 1, no adjustment for covariates; model 2, adjusted for age, sex, and race; and model 3, adjusted for all covariates presented in Table 1. Subgroup analyses, stratified by sex, age, race and, BMI were further performed.

Table 1 Characteristic of study sample with and without type 2 diabetes
Full size table

Results

The characteristics of the study sample, according to T2DM status, are presented in Table 1. Of the 2,780 participants enrolled, 749 had a diagnosis of T2DM, with the other 2,031 classified in the non-DM group. Compared to the non-DM group, participants with T2DM were older, had a higher BMI and levels of ALP, ALT, GGT, uric acid, and BUN, had higher CAP and LSM values, a higher proportion of liver steatosis and significant fibrosis, and a lower level of total cholesterol.

Association between T2DM status and CAP

After adjustment for potential confounding factors, T2DM status was positively associated with CAP (β = 16.8, 95% CI, 11.8–21.8; Table 2). On subgroup analyses, this positive association was more prominent among women (β = 19.7, 95% CI, 12.6–26.7) than it was among men (β = 12.2, 95% CI, 4.9–19.4), and in the non-hispanic black (β = 19.5, 95% CI, 9.1–29.9), other race (β = 19.4, 95% CI, 10.2–28.5), and BMI < 25 kg/m2 (β = 19.8, 95% CI, 8.7–31.0) groups.

Table 2 Association between type 2 diabetes status and controlled attenuation parameter (dB/m)
Full size table

Association between T2DM status and risk of liver steatosis

In the fully adjusted model (Table 3), T2DM status was positively associated with prevalence of liver steatosis (OR = 1.7, 95% CI, 1.3–2.1). On subgroup analyses, this positive association was more prominent among women (OR = 1.8, 95% CI, 1.3–2.5) than men (OR = 1.5, 95% CI: 1.0–2.1), and in the non-Hispanic Black (OR = 1.8, 95% CI, 1.1–3.0), other race (OR = 1.9, 95% CI, 1.2–3.0), and BMI < 25 kg/m2 (OR = 2.0, 95% CI, 1.1–3.8) groups.

Table 3 Association between type 2 diabetes status and prevalence of liver steatosis
Full size table

Association between T2DM status and LSM

In the fully adjusted model, there was a positive association between T2DM status and LSM (β = 0.8, 95% CI, 0.2–1.3; Table 4). On subgroup analyses, this positive association was only identified among men (β = 0.9, 95% CI, 0.0–1.8) and in the 40–59 age (β = 1.0, 95% CI, 0.1–1.8), other race (β = 1.8, 95% CI, 0.8–2.9), and BMI ≥ 30 kg/m2 (β = 1.0, 95% CI, 0.1–1.9) groups.

Table 4 Association between type 2 diabetes status and liver stiffness (kpa)
Full size table

Association between T2DM status and risk of significant fibrosis

In the fully adjusted model, T2DM status and prevalence of significant fibrosis were positively correlated (OR = 2.0, 95% CI, 1.5–2.7) (Table 5). On subgroup analyses, this positive association was more prominent among individuals in the other race (OR = 2.9, 95% CI, 1.5–5.5) and BMI < 25 kg/m2 (OR = 3.3, 95% CI, 1.3–8.8) groups.

Table 5 Association between type 2 diabetes status and prevalence of significant fibrosis
Full size table

Discussion

In this study, we evaluated the association between T2DM status and prevalence of liver steatosis and fibrosis among adults aged ≥ 40 years, and found that T2DM was associated with a significantly higher prevalence of liver steatosis, with this association being more prominent among women and the non-Hispanic Black, other race, and BMI < 25 kg/m2 groups. T2DM also positively correlated with the prevalence of significant fibrosis, which was more prominent in the other race and BMI < 25 kg/m2 groups.

The bidirectional and mutual relationship between T2DM and NAFLD has been highlighted by epidemiological studies, with NAFLD increasing the risk of T2DM incidence, and T2DM increasing the risk of NAFLD incidence and progression [14]. A recent meta-analysis showed that the pooled prevalence of NAFLD among adults with T2DM was around 60%, with this prevalence varying by age and by BMI [15]. Compared to non-diabetes patients, those with combined NAFLD and T2DM have a higher risk of NAFLD progression [16]. A previous NHANES study (NHANES III) revealed that diabetes was associated with all-cause and cardiovascular mortality among individuals with NAFLD [17].

Among the non-invasive tests for NAFLD, TE is the most widely used for the assessment of liver fibrosis [18]. A higher prevalence of advanced fibrosis assessed via TE was observed among patients with T2DM [19,20,21,22]. The results of a recent NHANES study reported high rates of hepatic steatosis and fibrosis, diagnosed by CAP and LSM, among patients with T2DM, but with race-dependent differences [23]. Similarly, in our study, the association between T2DM status and CAP or LSM was prominent in some races, but not in others, including a non-significant association among Mexican–American individuals.

The common pathophysiological mechanisms shared by NAFLD and T2DM include a series of metabolic changes; in particular, changes in the white adipose tissue may play a central role in the initiation of both NAFLD and T2DM [24]. In 2020, an international panel of experts from 22 countries proposed the novel term “metabolic dysfunction-associated fatty liver disease” to replace NAFLD, which further emphasizes the strong association between T2DM and NAFLD [25]. NAFLD and T2DM not only have almost the same risk factors, but also have synergistic effects on each other’s disease progression and complications. Therefore, routine screening for T2DM among individuals with NAFLD and lifestyle changes, including diet modifications and physical activity, are recommended for the prevention and management of both T2DM and NAFLD.

Our study had some limitations. First, as this was a cross-sectional study, no causality could be established. Second, we excluded participants with age of DM onset of < 30 years of age to minimize the number of participants with T1DM, as previously described [26, 27], as the NHANES database does not differentiate diabetes by type. Third, the values of CAP defining hepatic steatosis and LSM defining significant fibrosis are both inconsistent among different studies using NAHENS 2017–2018 database [13, 28, 29]. Thus, the sensitivity and specificity of TE test may vary depending on the cut-off values. Fourth, differences in measurements depending on the probe used in FibroScan have been demonstrated in previous reports [30, 31]. However, the elastography exams were performed by trained and certified technicians, according to the manufacturer guidelines [32]. Last, self-reported confounders may be susceptible to individual biases. This source of bias was minimized by the utilization of the NHANES data, which is collected by trained personnel through established procedures.

Conclusion

In conclusion, our findings indicate that T2DM is positively associated with prevalence of hepatic steatosis and fibrosis. This association was more prominent for individuals with a BMI < 25 kg/m2 and was influenced by race-specific effects. Routine screening for T2DM among individuals with NAFLD may contribute to the prevention and the management of both T2DM and NAFLD.

Availability of data and materials

The datasets generated and analysed during the current study are available in the NHANES website (http://www.cdc.gov/nchs/nhanes.htm).

Abbreviations

NAFLD:

Non-alcoholic fatty liver disease

T2DM:

Type 2 diabetes mellitus

TE:

Transient elastography

NHANES:

National Health and Nutrition Examination Survey

CAP:

Controlled attenuation parameter

LSM:

Liver stiffness measurement

HbA1c:

Glycohemoglobin

BMI:

Body mass index

DM:

Diabetes mellitus

BUN:

Blood urea nitrogen

GGT:

Gamma-glutamyl transpeptidase

ALT:

Alanine amino transferase

ALP:

Alkaline phosphatase

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Acknowledgements

The authors appreciate the time and effort given by participants during the data collection phase of the NHANES project.

Funding

This study received no funding.

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Authors and Affiliations

  1. Department of Endocrinology, The First People’s Hospital of Xiaoshan District, Xiaoshan Affiliated Hospital of Wenzhou Medical University, Hangzhou, 311200, Zhejiang, China

    Jun Chen

  2. Department of Infectious Diseases, The First People’s Hospital of Xiaoshan District, Xiaoshan Affiliated Hospital of Wenzhou Medical University, Hangzhou, 311200, Zhejiang, China

    Piao Hu

  3. Department of Medical Oncology, The First People’s Hospital of Xiaoshan District, Xiaoshan Affiliated Hospital of Wenzhou Medical University, Hangzhou, 311200, Zhejiang, China

    Yanfei Wang

  4. Clinical Research Center, The First People’s Hospital of Xiaoshan District, Xiaoshan Affiliated Hospital of Wenzhou Medical University, Hangzhou, 311200, Zhejiang, China

    Zhongxin Zhu

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Contributions

JC, PH, and YFW contributed to data collection, analysis and writing of the manuscript. ZXZ contributed to study design and editing of the manuscript. The author(s) read and approved the final manuscript..

Corresponding author

Correspondence to Zhongxin Zhu.

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The ethics review board of the National Center for Health Statistics approved all NHANES protocols and written informed consents were obtained from all participants.

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The authors declare that they have no competing interests.

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Chen, J., Hu, P., Wang, Y. et al. Association between type 2 diabetes status and prevalence of liver steatosis and fibrosis among adults aged ≥ 40 years. BMC Endocr Disord 22, 128 (2022). https://doi.org/10.1186/s12902-022-01046-y

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Keywords

BMC Endocrine Disorders

ISSN: 1472-6823

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