- 1Department of Medical Sciences, University of Turin, Turin, Italy
- 2Division of Endocrinology, Diabetes and Metabolism, Azienda Ospedaliera Universitaria (AOU) Città della Salute e della Scienza di Torino, Turin, Italy
- 3Division of Gastroenterology and Hepatology, Azienda Ospedaliera Universitaria (AOU) Città della Salute e della Scienza di Torino, Turin, Italy
- 4Clinical Biochemistry Laboratory “Baldi e Riberi”, Azienda Ospedaliera Universitaria (AOU) Città della Salute e della Scienza di Torino, Turin, Italy
- 5Division of Internal Medicine 3, Azienda Ospedaliera Universitaria (AOU) Città della Salute e della Scienza di Torino, Turin, Italy
Introduction: Metabolic dysfunction–associated steatotic liver disease (MASLD) is highly prevalent among individuals with type 2 diabetes mellitus (T2DM), and liver fibrosis represents its strongest predictor of adverse outcomes. Soft drinks (SDs), a major source of added sugars and fructose, have been linked to metabolic disorders, but evidence on their relationship with liver fibrosis in patients with T2DM is limited. This study investigated the association between SDs consumption and liver fibrosis in adults with both T2DM and liver steatosis.
Methods: We analyzed 273 participants from the TESEO-DM cohort with imaging-documented hepatic steatosis (Controlled Attenuation Parameter, CAP ≥248 dB/m). SDs intake was assessed using the validated EPIC food frequency questionnaire and categorized as rarely/never, 1–4 servings per month, or >1 servings per week. Liver stiffness measurement (LSM) was assessed using vibration-controlled transient elastography and LSM >7 used as cut-off to define significant liver fibrosis.
Results: In age- and sex-adjusted linear regression, SDs intake was directly associated with LSM (β = 0.181, 95% CI: 0.062–0.299, p = 0.003). The association remained significant after adjustment for diabetes duration, total caloric intake, high-density lipoprotein cholesterol, and either body mass index (β = 0.153, 95% CI: 0.032–0.274, p = 0.014) or CAP (β = 0.150; 95% CI: 0.028–0.274; p = 0.017). In logistic regression, participants consuming >1 SDs per week had increased odds of significant liver fibrosis (OR: 3.77, 95% CI: 1.33–10.66) compared with those rarely or never consuming SDs independent of age, sex, diabetes duration, and obesity. Inclusion into the model of tertiles of CAP in place of obesity did not modify the results (OR: 3.11 95% CI: 1.09–8.86).
Conclusions: These findings suggest that even modest soft drink consumption is independently associated with higher liver stiffness in individuals with T2DM and liver steatosis, supporting recommendations to limit added sugar intake for liver health.
1 Introduction
Metabolic dysfunction–associated steatotic liver disease (MASLD), formerly referred to as nonalcoholic fatty liver disease (NAFLD), is the most common chronic liver disorder worldwide and a leading cause of mortality (1–4). It encompasses a spectrum of hepatic injury ranging from simple steatosis to steatohepatitis (MASH—metabolic dysfunction-associated steatohepatitis) with increasing degree of fibrosis (3, 5). Among these, liver fibrosis is the strongest predictor of clinical outcomes, being closely associated with advanced liver disease, hepatocellular carcinoma, and both liver-related and cardiovascular mortality (2, 6). Therefore, the identification of modifiable risk factors for fibrosis represents a major priority for prevention and early intervention (3, 5).
MASLD is tightly linked to metabolic dysfunction. Obesity, metabolic syndrome, and type 2 diabetes mellitus (T2DM) are among its most important risk factors (1, 5). In fact, MASLD prevalence has been reported to range between 65.3 and 73.6% among individuals with T2DM (7, 8). Moreover, both the presence and duration of T2DM are major determinants of fibrosis progression in MASLD (9).
Soft drinks (SDs) are a prominent component of modern dietary patterns and represent a major source of added sugars. They are also rich in fructose, which promotes hepatic gluconeogenesis and de novo lipogenesis, thereby favoring hepatic fat accumulation (10). SDs consumption has been associated with a wide range of adverse health outcomes (11–13), including NAFLD (14). A prospective cohort study demonstrated a clear dose–response relationship, with consumption of four or more servings per week associated with a 45% increased risk of incident NAFLD (15). Also, a case-control study found an association between SDs consumption and liver steatosis independently of metabolic syndrome diagnosis (16). Furthermore, a short-term clinical trial among adolescent boys aged 11–16 years showed that reducing free sugar and fructose intake significantly decreased liver fat compared with a usual diet (17).
While these findings support an indirect role of SDs in fibrosis development—primarily through obesity and steatosis—evidence for a direct relationship between SDs and liver fibrosis in MASLD remains limited (18). Importantly, data in high-risk populations, such as individuals with T2DM, are still lacking.
In this study, we aimed to investigate the association between SDs consumption and liver fibrosis in a cohort of patients with T2DM and MASLD.
2 Materials and methods
2.1 Study design and population
The study included individuals with T2DM who were consecutively and prospectively enrolled between July 2019 and February 2025 as part of the ongoing TESEO-DM (Traguardi di Eccellenza nelle Scienze mediche Esplorando le Omiche - Diabete Mellito) cohort, which investigates chronic complications of T2DM. Eligible participants were adults (≥18 years) referred for the first time to the Unified Diabetes Center at San Giovanni Antica Sede Hospital (Turin). Upon enrollment, detailed demographic and clinical data were collected, including age, sex, physical activity, alcohol and tobacco use, cardiovascular risk factors, chronic diabetes complications, and current pharmacologic treatments. The European Prospective Investigation into Cancer and Nutrition (EPIC) and the Mediterranean Diet Score (MDS) questionnaire was administered to explore nutritional habits by a single qualified dietitian (19, 20). All participants underwent a complete physical examination with evaluation of anthropometric parameters, fasting blood sampling for biochemical analyses, and vibration controlled transient elastography (VCTE) with assessment of controlled attenuation parameter (CAP; FibroScan®530, Echosens, Paris, France). Additional assessments included fundus oculi examination, 12-lead electrocardiogram, and transthoracic echocardiography.
The initial TESEO-DM cohort comprised 442 adult patients with T2D of whom 324 had a diagnosis of MASLD (21) and were therefore selected for further analysis. A total of 273 participants were ultimately included in the analysis (Figure 1) after applying the following exclusion criteria: missing data on soft drink consumption, missing or inaccurate liver stiffness measurement, presence of other known causes of liver disease (e.g., viral hepatitis, autoimmune hepatitis, hemochromatosis, Wilson's disease, alpha-1 antitrypsin deficiency, or drug-induced injury). Alcohol abuse was defined as a self-reported ethanol intake >140 g per week for women and 210 g per week for men. The study protocol was approved by the local Ethics Committee, and all participants provided written informed consent prior to enrollment.
Figure 1. Participant selection flow diagram. MASLD, metabolic dysfunction-associated steatotic liver disease; T2DM, type 2 diabetes mellitus.
2.2 Biochemistry
Glycated hemoglobin (HbA1c) was measured using an immunoenzymatic assay and standardized to the Diabetes Control and Complications Trial (DCCT) reference system. Total cholesterol, triglycerides, high-density lipoprotein (HDL) cholesterol, aspartate aminotransferase (AST), alanine aminotransferase (ALT), and serum creatinine were determined using automated enzymatic assays on a Cobas-Bio analyzer.
2.3 Definitions and calculations
Physical activity was assessed using the short version of the International Physical Activity Questionnaire (IPAQ-short) (22), with total weekly energy expenditure calculated as metabolic equivalent tasks (METs) × minutes of activity (MET-min/week) and classified as low (< 700), intermediate (700–2,519), or high (>2,519). Participants were categorized into three groups based on smoking status: current smokers, former smokers, and never smokers. Body mass index (BMI) was calculated as weight in kilograms divided by height in meters squared (kg/m2). General obesity was defined as a BMI ≥30 kg/m2. Blood pressure (BP) was measured using a standard manual sphygmomanometer (Hawksley, Lancing, UK). Hypertension was defined as systolic BP ≥130 mmHg and/or diastolic BP ≥80 mmHg, confirmed on at least two separate visits, or current use of antihypertensive medications (23). Low-density lipoprotein cholesterol (LDL-C) was estimated using the Friedewald formula. Estimated glomerular filtration rate (eGFR) was calculated from serum creatinine using the CKD-EPI formula. Chronic kidney disease (CKD) was defined as eGFR ≤ 60 ml/min/1.73 m2 (24). Diabetic retinopathy was evaluated by a specialist ophthalmologist using retinal images acquired with the Optomed Aurora device (Midimedical). Retinopathy was classified as absent or present and the more severely affected eye was used for classification. Coronary heart disease (CHD) was defined as a documented history of myocardial infarction, angina pectoris, percutaneous coronary intervention (PCI), or coronary artery bypass grafting (CABG). Participants showing clinical, electrocardiographic, or echocardiographic signs suggestive of CHD were classified as CHD patients if the diagnosis was confirmed by further evaluation.
2.4 Frequency of soft drinks intake and Mediterranean diet
Dietary habits were assessed using the validated food frequency questionnaire developed within the EPIC study (19). The questionnaire assessed SDs consumption during the year preceding the interview, with frequencies ranging from “never or < 1 serving per month” to “≥6 servings per day.” For analytical purposes, participants were categorized into four groups: never/rarely, 1–4 servings/month, >1 serving/week, >1 serving/day. Average daily caloric intake was estimated using the FETA EPIC software (25).
Adherence to the Mediterranean diet was evaluated using the 14-item Mediterranean Diet Score (MDS) questionnaire (20), a self-administered tool with binary (yes/no) responses across key dietary components. One point was assigned for each affirmative response, with higher total scores indicating greater adherence to the Mediterranean dietary pattern.
2.5 Assessment of liver status
Vibration-controlled transient elastography (VCTE) with controlled attenuation parameter (CAP) was performed after an overnight fast to assess liver stiffness and hepatic steatosis. Examinations were conducted with participants in the supine position, the right arm extended above the head, and the probe (M or XL, according to body habitus) placed in the right intercostal spaces. For each subject, at least 10 valid measurements were obtained, and the median value was recorded. Only technically reliable results, defined as an interquartile range (IQR)/median < 30%, were included in the analysis (26). Liver stiffness was expressed in kilopascals (kPa) and CAP in decibels per meter (dB/m). Significant liver fibrosis was defined as LSM >7.0 kPa, while hepatic steatosis was defined as CAP ≥248 dB/m (5).
2.6 Statistical analysis
Continuous variables are presented as mean ± standard deviation (SD) when normally distributed, and as median with interquartile range (IQR) when non-normally distributed. Categorical variables are reported as absolute numbers and percentages. Normality was assessed using the Shapiro–Wilk and Kolmogorov–Smirnov tests. Between-group comparisons of continuous variables were performed using two-tailed Student's t-tests for independent samples or ANOVA, as appropriate. Non-normally distributed variables were log-transformed prior to analysis. Categorical variables were compared using the Chi-square test or Fisher's exact test, as appropriate.
Univariate and multivariate linear regression analyses were performed to evaluate the association between liver stiffness measurement (LSM, dependent variable) and increasing categories of SDs intake (independent variable), adjusting for relevant covariates: age, sex, diabetes duration, total caloric intake, HDL, and either BMI or CAP tertiles. Due to collinearity between BMI and CAP, separate models were fitted for each variable.
Logistic regression models were used to assess the association between SDs intake categories and the odds of clinically significant liver fibrosis, defined using two clinically relevant cut-offs (>7 kPa and ≥8 kPa). Multivariable models were adjusted for age, sex, diabetes duration, obesity, and categories of SDs intake.
All statistical tests were two-sided, and a p-value < 0.05 was considered statistically significant. Analyses were conducted using SPSS Statistics, version 29.0.2.0 (IBM Corp., Armonk, NY, USA).
3 Results
3.1 Study population
Table 1 summarizes the demographic, anthropometric, and clinical characteristics of the 273 participants included in the study. The mean age was 61.04 ± 8.1 years, with a slight greater prevalence of women. Average adherence to the Mediterranean diet was relatively high. However, only 9.2% reported high levels of physical activity, and 18.7% were current smokers. Obesity was present in 70% of participants, while nearly all had arterial hypertension (93.4%). The cohort was characterized by a relatively short duration of diabetes and generally good glycemic control. The prevalence of diabetes-related complications was 10.3% for CKD, 6.6% for diabetic retinopathy, and 12.1% for CHD.
Table 1. Demographic and clinical characteristics of the 273 subjects with type 2 diabetes of the TESEO study.
3.2 Soft drink intake
Overall, SDs consumption was low. More than half of the participants (53.5%) reported rarely or never consuming SDs, 35.5% consumed 1–4 servings per month, 9.9% consumed >1 servings per week, and only 1.1% reported >1 serving/day. Two highest SDs intake categories were thus combined. Table 2 presents the demographic, anthropometric, and clinical characteristics stratified by SDs consumption. Age, adherence to the MedDiet, total calorie intake, diabetes duration, BMI, and HDL cholesterol levels differed significantly across groups. No significant differences were observed in level of physical activity, smoking status, HbA1c, triglycerides, hypertension, or total and LDL cholesterol across SDs intake categories.
Table 2. Demographic, anthropometric, and clinical characteristics of the study population stratified by soft drinks consumption.
3.3 Liver fibrosis
The median CAP and LSM values in the study population were 308.0 (279.0–341.0) dB/m and 5.2 (4.4–6.0) kPa, respectively. Significant liver fibrosis was present in 13.6% of participants. Table 3 summarizes demographic, anthropometric, and clinical characteristics according to fibrosis status. Participants with fibrosis had a less favorable metabolic profile, with a higher prevalence of obesity, higher total calorie intake and lower HDL cholesterol levels. By contrast, no significant differences were observed in HbA1c, total and HDL cholesterol, triglycerides, and prevalence of hypertension. As expected, AST, ALT, and CAP values were significantly higher among participants with liver fibrosis.
Table 3. Demographic, anthropometric, and clinical characteristics of the study population stratified by fibrosis status.
SDs consumption also differed significantly by fibrosis status, primarily driven by the subgroup consuming ≥2 servings per week, which was more prevalent among participants with fibrosis (24.3%) compared with those without (8.9%).
3.4 Linear regression analysis
In the age- and sex-adjusted linear regression analysis, soft drink intake was positively associated with log-LSM (β = 0.181; 95% CI: 0.062–0.299; p = 0.003).
In the multivariate model, this association remained significant after additional adjustment for diabetes duration, log-total caloric intake, BMI, and log-HDL (β = 0.153; 95% CI: 0.030–0.270; p = 0.014). Besides SDs intake, variables significantly associated with log-LSM were diabetes duration (β = 0.133; 95% CI:0.020–0.246; p = 0.022) and BMI (β = 0.301; CI: 0.189–0.412; p < 0.001). BMI and CAP were modeled separately to prevent collinearity, and results remained consistent when BMI was replaced by log-CAP (β = 0.150; 95% CI: 0.028–0.274; p = 0.017).
3.5 Logistic regression analysis
Multivariable logistic regression analyses were performed to evaluate whether classes of SDs consumption were independently associated with liver stiffness after adjustment for potential risk factors and confounders. High soft drink intake (>1 serving/week) was associated with increased odds [OR: 3.77; 95% CI: 1.33–10.66] of liver stiffness (LSM >7) compared to subjects never/rarely assuming SDs, after adjustment for age, sex, diabetes duration, and obesity (Table 4). A sensitivity analysis applying the LSM ≥8 kPa threshold yielded consistent results (OR: 5.07; 95% CI 1.52–16.90; Supplementary Table S1). Inclusion into the model of tertile of CAP in place of obesity did not modify the results (LSM >7 OR: 3.11 95% CI: 1.09–8.86).
Table 4. Logistic regression: association between frequency of soft drinks consumption and LSM>7 kPa.
4 Discussion
In this cross-sectional study of adults with T2DM, we found a strong and independent association between SDs consumption and liver stiffness, as measured by transient elastography, suggesting that SDs intake may contribute to an increased risk of liver fibrosis in this high-risk population.
In multivariable linear regression analyses, the frequency of SDs intake was positively associated with liver stiffness after adjustment for multiple confounders, including total caloric intake, BMI, and CAP. Consistently, in logistic regression, participants consuming >1 serving/week of SDs had a 3.77-fold higher odds of significant liver fibrosis compared with those who rarely or never consumed SDs, independent of obesity and diabetes duration. Notably, the association was even stronger when applying a stricter fibrosis threshold (LSM ≥8.0 kPa) that identifies individuals at moderate-to-high risk of advanced fibrosis (27). Since only 9.2% of participants had LSM ≥8.0 kPa, this result should be interpreted cautiously; nonetheless, the consistent directionality across thresholds supports the robustness of the association.
SD consumption has been consistently linked to MASLD in both cross-sectional and prospective studies (1, 14, 17, 28). This relationship is independent of metabolic syndrome (16) and is observed even for “diet SDs” (29). Recently, higher consumption of sugar-sweetened beverages was also associated with increased liver stiffness in healthy adults (18). To our knowledge, however, this is the first study to explore this association between SD consumption and liver fibrosis specifically in individuals with T2DM - a group at particularly high risk for progression of MASLD.
Our findings suggest that SDs may promote hepatic fibrogenesis through mechanisms extending beyond fat accumulation and metabolic dysregulation. The biological plausibility of this association is supported by experimental evidence showing that fructose-rich beverages enhance de novo lipogenesis, hepatic fat deposition, and oxidative stress—pathways that can accelerate hepatocellular injury and fibrogenesis (30, 31).
Overall, SDs consumption was low, with only 1.1% of participants reporting intake of more than one serving per week. However, SDs consumption in the general Italian population of a similar age range is also relatively low compared with that of other European countries (32) and of the United States (US) (33). The relatively low SDs exposure in this Mediterranean cohort provides a unique setting, illustrating that adverse associations can arise even at lower consumption levels than those typically reported in North American populations. SDs consumption is a negative component of the MedDiet score (20), therefore the MedDiet score was not included as a covariate in our regression models to avoid multicollinearity. Nevertheless, recent evidence indicates that greater adherence to the MedDiet is independently associated with a lower risk of liver fibrosis (34–36), and our findings suggest that this protective effect may be partly mediated by reduced SDs consumption.
Significant fibrosis was relatively uncommon, likely reflecting the short duration of T2DM in this cohort. Interestingly, participants with significant fibrosis showed no differences in HbA1c, triglycerides, total cholesterol, or blood pressure, suggesting that traditional metabolic markers may not fully capture the risk of hepatic injury. Notably, in the logistic model, the association between intermediate SDs intake and liver fibrosis did not reach statistical significance compared with non-consumers, possibly reflecting either a threshold effect or limited power to detect smaller effects at lower exposure levels.
This study has several strengths. Participants were well-characterized in terms of anthropometric, metabolic, and clinical parameters. SDs consumption was assessed using the validated EPIC food frequency questionnaire, which captures total energy intake and allows for adjustment by caloric intake, thereby reducing residual confounding. Liver fibrosis was evaluated using VCTE, a well-validated, non-invasive technique that shows strong correlation with histological fibrosis and predicts both liver-related and overall mortality (37, 38). This method was preferred to surrogate indices such as the NFS or FIB-4, which have lower accuracy (39). Moreover, since BMI is a component of the NFS and age is included in both NFS and FIB-4 (5), adjusting for these variables as potential confounders is inherently limited when using such composite scores. Although sample size was relatively small, given the limited number of studies investigating hepatic fibrosis, our results address an important knowledge gap in MASLD epidemiology.
However, several limitations should be acknowledged. First, the cross-sectional design precludes causal inference. Second, SDs intake was self-reported and assessed using a single question. However, dietary data were collected by trained dietitians rather than through self-administration, further enhancing accuracy and reliability. Moreover, any misclassification would probably attenuate rather than exaggerate observed associations. Third, the relatively small number of daily SDs consumers and of people with significant liver fibrosis limited statistical power. Fourth, liver steatosis was diagnosed using CAP, which performs well in detecting fatty liver, but optimal thresholds vary widely (40) meaning some cases of mild steatosis with elevated LSM may have been missed. Finally, liver fibrosis was not histologically confirmed, and thus some degree of misclassification cannot be excluded—although this would tend to bias results toward the null.
In conclusion, this study provides novel evidence that SDs consumption is independently associated with increased liver stiffness in individuals with T2DM and MASLD. The results reinforce current dietary recommendations to limit SDs intake as part of comprehensive lifestyle strategies aimed at preventing or slowing MASLD progression in patients with diabetes. Prospective and interventional studies are warranted to confirm causality and clarify whether reducing SDs consumption can attenuate fibrosis progression over time.
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics statement
The studies involving humans were approved by Comitato etico territoriale interaziendale AOU Città della Salute e della Scienza di Torino. The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.
Author contributions
AF: Data curation, Formal analysis, Writing – original draft. MB: Data curation, Formal analysis, Writing – original draft. GC: Data curation, Writing – review & editing. AA: Data curation, Writing – review & editing. SB: Data curation, Writing – review & editing. SL: Data curation, Writing – review & editing. GM: Writing – review & editing. FBa: Writing – review & editing. FBr: Conceptualization, Writing – review & editing. GB: Conceptualization, Writing – review & editing. EB: Writing – review & editing. MD: Conceptualization, Supervision, Writing – review & editing. GG: Conceptualization, Data curation, Formal analysis, Supervision, Writing – original draft.
Funding
The author(s) declared that financial support was received for this work and/or its publication. This work was supported by Turin University, Italian Ministry for Education, University and Research (Ministero dell“Istruzione, dell”Università e della Ricerca–MIUR) under the program “Dipartimenti di Eccellenza 2018–2022” project D15D18000410001; “Dipartimenti di Eccellenza 2024–2026” (UNITO-ECC_D223; AI4MED); Novo Nordisk “Gestione delle complicanze croniche del diabete: from bedside to bench?” (Sponsor n1/2021). AA was funded by: PNRR “D3 4 Health–Digital Driven Diagnostics, prognostics and therapeutics for sustainable Health care,” Piano Nazionale per gli investimenti Complementari (PNC) al Piano Nazionale di Ripresa e Resilienza—Decreto di Concessione n. 1986 del 9 dicembre 2022, Codice progetto MUR: PNC0000001—CUP ENTE: B53C22006110001.
Conflict of interest
The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fnut.2025.1726040/full#supplementary-material
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Keywords: lifestyle, liver fibrosis, liver stiffness, MASLD, soft drink, sugar-sweetened beverage, type 2 diabetes
Citation: Ferro A, Bollati M, Caviglia GP, Armandi A, Bellini S, Limoncelli S, Mengozzi G, Barutta F, Broglio F, Beccuti G, Bugianesi E, Durazzo M and Gruden G (2025) Soft drink consumption and liver fibrosis in type 2 diabetes. Front. Nutr. 12:1726040. doi: 10.3389/fnut.2025.1726040
Received: 15 October 2025; Revised: 26 November 2025;
Accepted: 30 November 2025; Published: 18 December 2025.
Edited by:
Yannan Jin, King's College London, United KingdomReviewed by:
Theodoros Androutsakos, National and Kapodistrian University of Athens, GreeceSara Taha Elazab, Mansoura University, Egypt
Copyright © 2025 Ferro, Bollati, Caviglia, Armandi, Bellini, Limoncelli, Mengozzi, Barutta, Broglio, Beccuti, Bugianesi, Durazzo and Gruden. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Marilena Durazzo, bWFyaWxlbmEuZHVyYXp6b0B1bml0by5pdA==
†These authors have contributed equally to this work and share first authorship
‡These authors have contributed equally to this work and share last authorship
Martina Bollati1,2†