Diabetes, Obesity & Metabolism最新文献

Objective: Transportation noise is increasingly recognized as a cardiometabolic stressor, but its relationship with type 2 diabetes mellitus (T2DM) remains poorly defined. We examined whether transportation noise exposure was associated with incident T2DM in a large, diverse U.S. healthcare system cohort.

Methods: We identified adults without baseline T2DM from the Houston Methodist Learning Health System Registry (2016-2023). Transportation noise exposure was assigned at the census block group level using the 2020 U.S. Department of Transportation National Transportation Noise Map. Five noise categories were examined: Road, Rail, Aviation, Road plus Aviation and Total. Cox proportional hazards models estimated associations across predefined categories, Quiet (≤45 dB), Moderate (45-54 dB) and Loud (≥55 dB), and per 10 dB increase, adjusting for demographics, cardiometabolic risk factors, socioeconomic vulnerability and PM₂.₅.

Results: Among 984 658 adults (2.1 million person-years), 39 587 developed T2DM (1.88 per 100 person-years). Loud rail noise (HR 1.14; 95% CI: 1.01-1.29) and loud total noise (HR 1.17; 95% CI: 1.03-1.33) were associated with higher T2DM risk. Continuous models showed similar patterns, with each 10 dB increase in rail noise (HR 1.09; 95% CI: 1.05-1.13) and road noise (HR 1.04; 95% CI: 1.01-1.08) associated with a higher hazard of incident T2DM. Effect sizes were modest but internally consistent and aligned with prior environmental noise studies.

Conclusion: Transportation noise, particularly rail noise, was associated with higher T2DM risk. Given plausible mechanisms involving sleep disruption and stress-related neuroendocrine activation, these findings add to evidence linking environmental noise to metabolic health and motivate further studies to evaluate causality and potential benefits of noise mitigation.

Aims: Longitudinal evidence is limited on how changes in insulin resistance (IR) indices-including estimated glucose disposal rate (eGDR), triglyceride-glucose index (TyG), metabolic score for insulin resistance (METS-IR), and lipid accumulation product (LAP)-relate to liver-related adverse outcomes. This study aims to assess their associations and the discriminative performance of IR indices.

Materials and methods: IR indices were calculated from UK Biobank data at two surveys (2006-2010 and 2012-2013). Liver-related adverse outcomes, including liver disease, major adverse liver outcomes (MALO), and metabolic dysfunction-associated steatotic liver disease (MASLD), were identified via ICD-10 codes. K-means clustering defined four change patterns per index, and cumulative averages reflected long-term exposure. Cox regression estimated hazard ratios (HRs) and 95% confidence intervals (CIs). Discriminative performance was assessed using receiver operating characteristic (ROC) curves.

Results: The participants were followed for a mean of 9.7 years. Compared with persistently low eGDR levels, the persistently high group was associated with significantly lower risks of liver-related adverse outcomes, with HRs of 0.52 (95% Cl: 0.35-0.77) for liver disease, 0.30 (0.19-0.49) for MALO, and 0.31 (0.17-0.55) for MASLD. In contrast, persistently high TyG, METS-IR, and LAP were associated with increased risks of liver-related adverse outcomes, with METS-IR showing the strongest association with MASLD (HR = 10.50, 4.00-27.58). Cumulative eGDR was inversely associated with liver-related adverse outcomes (per 1 SD increase: HRs ranged from 0.52 to 0.68), whereas TyG, METS-IR, and LAP were positively associated, with METS-IR showing the strongest link to MASLD (HR = 1.70, 1.48-1.96). LAP demonstrated the highest discriminative performance in ROC analysis, particularly in females and those under 60 (AUC for MALO in females: up to 0.813).

Conclusions: Dynamic changes in IR indices are independently associated with liver-related adverse outcomes. Among these indices, LAP showed relatively stronger discriminative performance in females. Collectively, these indices may have potential utility as non-invasive markers for liver disease risk stratification.

Aims: To evaluate the efficacy and safety of adding a fourth oral antidiabetic drug versus metformin uptitration in patients with type 2 diabetes inadequately controlled with oral triple therapy.

Materials and methods: In this 24-week, randomized, open-label trial, adults with type 2 diabetes having glycated haemoglobin (HbA_1C) 7.0-9.0% despite oral triple therapy with metformin plus a thiazolidinedione (TZD), sodium-glucose cotransporter 2 inhibitor (SGLT2i), or dipeptidyl peptidase 4 inhibitor (DPP-4i) were randomized to an oral quadruple add-on group or a metformin uptitration group. The quadruple group received the class not previously used (TZD, SGLT2i, or DPP-4i), whereas the metformin uptitration group increased the metformin dose by up to 500 mg per day. The primary endpoint was the change in HbA_1C at week 24. Secondary endpoints included fasting glucose, metabolic parameters, and safety.

Results: Hundred and ninety-three were evaluable: 48 in the metformin uptitration group and 145 in the quadruple group. Compared to baseline, HbA_1C at week 24 decreased by 0.70% (interquartile range [IQR] 0.40%, 1.10%) with quadruple therapy and 0.40% (IQR 0.10%, 0.80%) with metformin uptitration (p = 0.002). The rate achieving HbA_1C ≤7.0% was higher in the quadruple group (69.7% vs. 47.9%, p = 0.006). Insulin resistance improved only in the quadruple group and was accompanied by reduced albuminuria. Adverse events were mild and comparable between groups.

Conclusions: Oral quadruple therapy achieved greater glycaemic and metabolic improvement without compromising safety, compared with metformin uptitration, supporting its role as an intensification strategy.

Introduction: With new advancements in obesity medicine, clarity on goals and expectations for successful disease management is limited. This post hoc analysis assessed application of proposed treat-to-target (TtT) thresholds for obesity to the outcome measures of SURMOUNT-5, which randomised participants with obesity to tirzepatide or semaglutide.

Methods: The proportion of participants in each treatment group reaching proposed TtT thresholds for waist to height ratio (WHtR) <0.53, body mass index (BMI) <27 kg/m², or a combination was evaluated. The associations between the thresholds and achieving low disease activity to remission (meeting goals for at least four of five defined cardiometabolic risk parameters) and normalisation or improvement in SF-36v2 physical component score (PCS) from baseline to week 72 were explored.

Results: About 23.1%-33.9% of participants treated with tirzepatide and 14.2%-20.7% treated with semaglutide reached the TtT thresholds, with greater weight reduction than the overall population. About 77% of participants who reached WHtR <0.53 achieved low disease activity to remission, with an odds ratio of 2.31 (p < 0.001) compared to those who did not reach this target. The BMI threshold was not statistically associated with the assessed outcomes for SF-36v2 PCS.

Conclusion: In this post hoc analysis of SURMOUNT-5, most participants who reached the proposed TtT thresholds achieved the goal of low disease activity to remission defined by cardiometabolic risk parameters. These data suggest that TtT thresholds in obesity medicine may clarify goals in shared decision-making and improve clinical outcomes.

Aims: Little is known about how the alignment between daily behaviours, such as physical activity and eating, and chronotype relates to glucose metabolism. We investigated whether alignment of physical activity and meal timing with chronotype was associated with glycaemic parameters and with prediabetes or type 2 diabetes (T2DM).

Materials and methods: In a cross-sectional analysis of 1384 participants from The Maastricht Study, we examined associations between behaviour-chronotype alignment and glucose metabolism. Physical activity timing was assessed by accelerometry and defined as the daypart with the highest step count. Meal timing, from a chrono-nutrition questionnaire, was defined as the daypart with the most eating occasions. Chronotype was estimated using the midpoint of sleep on free days corrected for sleep debt. Alignment reflected concordance between behaviour timing and chronotype. Confounder-adjusted logistic and linear regression models estimated associations with (pre)diabetes and with log-transformed fasting plasma glucose (FPG), 2-h post-load glucose (2hPLG), and haemoglobin A1c (HbA1c).

Results: Weekday alignment of physical activity timing with chronotype was associated with lower HbA1c (β per 20% more aligned weekdays: -0.48%, 95% CI -0.95, -0.02). Weekday meal timing alignment was associated with lower odds of prediabetes or T2DM (OR aligned vs. misaligned: 0.62, 95% CI 0.43-0.89). No significant associations were observed for weekend alignment, for FPG or 2hPLG, or for interactions between activity and meal timing alignment.

Conclusions: Weekday, but not weekend, alignment of physical activity and meal timing with chronotype was modestly associated with more favourable glucose metabolism. These findings suggest a potential role of behaviour-chronotype alignment in metabolic health, warranting confirmation in prospective and intervention studies.

Aims: To assess the prevalence and risk factors of increased residual gastric content (RGC) under fasting conditions in patients with type 2 diabetes mellitus (T2DM) treated with glucagon-like peptide-1 receptor agonists (GLP-1 RAs), providing evidence for peri-procedural medication management.

Materials and methods: This single-centre prospective cohort study enrolled inpatients with T2DM at the Endocrinology Department of Ningbo No.2 Hospital between April and December 2024. Patients aged 18-80 years with BMI <40 kg/m² were categorized as GLP-1 RA users or non-users. Those with conditions known to affect gastric motility were excluded. After a standard overnight fast, bedside gastric ultrasonography was performed. The primary outcome was the prevalence of increased RGC, defined as solid content or clear fluid volume >1.5 mL/kg. Secondary analyses explored associated risk factors.

Results: Of 390 patients included (237 [60.8%] male), 224 (57.4%) were GLP-1 RA users. After propensity score matching, the prevalence of increased RGC remained significantly higher in GLP-1 RA users compared with non-users (53.3% vs. 32.1%; p < 0.001). In multivariate logistic regression adjusted by inverse probability of treatment weighting (IPTW), GLP-1 RA use was robustly associated with increased RGC (OR 2.52; 95% CI 1.84-3.45). Notably, diabetic retinopathy (OR 1.84; 95% CI 1.14-2.99) and diabetic kidney disease (OR 1.67; 95% CI 1.17-2.39) emerged as independent risk factors, identifying a high-risk microvascular phenotype. Furthermore, among GLP-1 RA users, each additional day since the last GLP-1 RA dose reduced the odds of increased RGC by 23% (adjusted OR 0.77; 95% CI 0.65-0.90).

Conclusions: GLP-1 RA therapy is a potent, independent driver of significant gastric retention in patients with T2DM, persisting despite standard fasting. Crucially, the presence of diabetic retinopathy or nephropathy identifies a "double-hit" high-risk phenotype, where pharmacological delay interacts with microvascular burden. These findings suggest that current fasting protocols may be insufficient for these patients, necessitating individualized preoperative assessment based on microvascular status and dosing timing.

Aims: The 1 mg dexamethasone suppression test (DST) shows variable results in obesity, yet the impact of extreme obesity (body mass index [BMI] ≥50 kg/m²) on hypothalamic-pituitary-adrenal axis function remains poorly characterized. This study evaluated post-dexamethasone cortisol levels across distinct BMI categories and their associations with metabolic parameters.

Materials and methods: This retrospective study included 352 adults with obesity (BMI ≥30 kg/m²) who underwent 1 mg overnight DST between February 2019 and August 2023. Patients were stratified into three groups: BMI 30.0-39.9 kg/m² (n = 64), BMI 40.0-49.9 kg/m² (n = 202), and BMI ≥50.0 kg/m² (n = 86). Clinical, anthropometric, and laboratory parameters were compared between groups.

Results: The cohort had a median age of 41 years and comprised 284 females (80.7%). Post-dexamethasone cortisol levels showed modest differences across BMI categories (median 0.79, 0.77, and 0.88 μg/dL, respectively; p = 0.038). Inadequate cortisol suppression after the 1 mg dexamethasone test was rare, occurring in four patients (1.1%) overall: 0/64 (0%) in BMI 30.0-39.9 kg/m², 2/202 (1.0%) in BMI 40.0-49.9 kg/m², and 2/86 (2.3%) in BMI ≥50.0 kg/m²; continuous BMI was not associated with post-dexamethasone cortisol levels. Patients with super obesity demonstrated higher rates of hypertension (36% vs. 18.7-22.2%, p = 0.021) and diabetes (30.2% vs. 16.8-18.7%, p = 0.033).

Conclusions: These findings emphasize that elevated post-dexamethasone cortisol levels in patients with obesity should not be attributed to body weight alone but warrant appropriate evaluation for true hypercortisolism, with clinical interpretation guided by metabolic phenotype rather than BMI.

Aims: As type 2 diabetes (T2D) continues to rise globally and remains a major driver of cardiovascular disease, its remission has emerged as a therapeutic target. Current evidence supports bariatric surgery and low-calorie diets with meal replacements. No clinical trial to date has evaluated plant-based dietary alternatives as an intensive lifestyle intervention (ILI) strategy, despite the emphasis on plant-based diets in current clinical practice guidelines for diabetes and cardiovascular disease. The REmission of diabetes using a PlAnt-based weight loss InteRvention (REPAIR) trial will assess whether a 52-week plant-based ILI targeting ≥15% weight loss is effective for diabetes remission in a multi-ethnic Canadian population.

Materials and methods: The REPAIR trial is a prospective, randomised, 2-arm, open-label, blinded-endpoint efficacy trial. Participants will include 160 adults with early T2D (<6 years) and living with obesity. They will be randomised to standard of care or a 2-phase ILI targeting ≥15% weight loss consisting of a 12-week weight loss phase on a plant-based total diet meal replacement, followed by a 40-week weight loss maintenance phase on a plant-based dietary pattern combined with a 16-week structured exercise program, and a 52-week (19-session) sustainable behaviour change curriculum. The primary outcome is diabetes remission (HbA1c <6.5% without glucose-lowering medication for ≥3 months) and the key secondary outcome is the proportion achieving ≥15% weight loss at 52 weeks.

Conclusions: This trial will provide high-quality clinical evidence on the use of plant-based ILIs to address the epidemics of obesity and diabetes to inform public health policies and programs in Canada and beyond.