Combining Calculated Small Dense Low-Density Lipoprotein Cholesterol With Triglycerides for Refined Stratification of New Onset of Diabetes Mellitus

Q: What are the key findings of this study?

High calculated small dense LDL-C combined with high triglycerides was associated with a significantly increased risk of developing new-onset diabetes mellitus (HR 1.54).

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: Diabetes Mellitus (n=17290). Intervention: High calculated small dense LDL-C (sdLDL-C) and high triglycerides (TG) vs. Low sdLDL-C and low TG. Primary outcome: New onset of diabetes mellitus (HR 1.54, 95% CI 1.30-1.82, p=<0.001).

Q: What does this research mean for the field?

High calculated small dense LDL cholesterol combined with high triglycerides is associated with a significantly increased risk of new-onset diabetes mellitus. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Q: What question did this study set out to answer?

To determine whether calculated small dense low-density lipoprotein cholesterol (sdLDL-C), alone and combined with triglycerides or non-HDL cholesterol, predicts the new onset of diabetes mellitus.

Wataru Kawaharata; Marenao Tanaka; Yukinori Akiyama; Hidemichi Kouzu; Kei Nakata; Hiroki Aida; Itaru Hosaka; Rie Matsumori; Naoya Yama; Nagisa Hanawa; Tatsuya Sato; Masato Furuhashi

doi:10.1253/circrep.cr-26-0098

October 6, 2026Circulation ReportsOpen Access

Combining Calculated Small Dense Low-Density Lipoprotein Cholesterol With Triglycerides for Refined Stratification of New Onset of Diabetes Mellitus

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Key result

High small dense LDL-C plus high triglycerides linked to ~54% higher risk of new-onset diabetes.

HR 1.54
95% CI 1.30-1.82
P<0.001
n=17,290

Why the study?

It remains unclear whether estimated small dense LDL cholesterol is associated with the new onset of diabetes mellitus.

Does the combination of estimated small dense LDL-C and triglycerides improve risk stratification for predicting new-onset diabetes mellitus in a general Japanese population?

Key Points

To determine whether calculated small dense low-density lipoprotein cholesterol (sdLDL-C), alone and combined with triglycerides or non-HDL cholesterol, predicts the new onset of diabetes mellitus.
A cohort of Japanese individuals was followed over a 10-year follow-up period to monitor new-onset diabetes mellitus.
Estimated sdLDL-C was calculated using Sampson's equation; participants were stratified using cutoff values of 34.7 mg/dL for sdLDL-C, 100 mg/dL for triglycerides (TG), and 150 mg/dL for non-HDL-C.
Multivariable Cox proportional hazards regression and discrimination metrics (AUC and NRI) assessed prediction performance when added to traditional risk factors.
The incidence rate of diabetes was 13.3 per 1,000 person-years in the H-sdLDL-C/H-TG group, 8.3 in H-sdLDL-C/L-TG, 9.1 in L-sdLDL-C/H-TG, and 3.9 in L-sdLDL-C/L-TG.
High sdLDL-C was significantly associated with higher cumulative incidence of diabetes regardless of non-HDL-C or TG levels (log-rank test, P<0.001).
Adding the combined sdLDL-C/TG grouping to traditional risk factors achieved the highest discriminatory performance, yielding an AUC of 0.846 (95% CI: 0.832–0.861) and an NRI of 0.459 (95% CI: 0.401–0.519).

Study Design

Type

Cohort (n=17,290)

Multicenter

No

Structured PICO

Does the combination of estimated small dense LDL-C and triglycerides improve risk stratification for predicting new-onset diabetes mellitus in a general Japanese population?

P

Population

17,290 Japanese adults (mean age 47 years, 36.7% female) without diabetes at baseline who underwent annual health checkups, followed for 10 years to assess the incidence of new-onset diabetes mellitus.

E

Exposure

High estimated small dense LDL-C (sdLDL-C ≥34.7 mg/dL calculated by Sampson's equation) combined with high triglycerides (TG ≥100 mg/dL) or high non-HDL-C (≥150 mg/dL).

C

Comparator

Low estimated sdLDL-C (<34.7 mg/dL) combined with low triglycerides (<100 mg/dL) or low non-HDL-C (<150 mg/dL).

O

Outcome

New onset of diabetes mellitus (defined as fasting glucose ≥126 mg/dL, HbA1c ≥6.5%, or self-reported use of antidiabetic medication) over 10-year follow-up.surrogate

Main Result

Hazard Ratio: 1.54 (95% CI 1.3–1.82)

Absolute Event Rate: 13.3% vs 3.9%

p-value: p=<0.001

Combining estimated small dense LDL-C and triglycerides significantly improves risk reclassification and discrimination for the future development of diabetes mellitus beyond traditional risk factors.

Limitations

Potential selection bias as participants voluntarily attended health examinations at a single urban clinic
Study population was restricted to Japanese individuals, requiring external validation in other ethnic groups
Lack of detailed information on dietary intake, physical activity, and other lifestyle factors
Cutoff value for sdLDL-C was determined by ROC analysis within the same cohort
Directly measured sdLDL-C levels were not available
Combination of estimated sdLDL-C with non-HDL-C or TG may partly reflect overlapping information

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Implication

May warrant closer diabetes surveillance in this lipid profile; hypothesis-generating and requires prospective validation.

Abstract

Background: The small dense low-density lipoprotein cholesterol (sdLDL-C) level as a predictor of atherosclerosis is elevated in patients with insulin resistance who have high levels of non-high-density lipoprotein cholesterol (non-HDL-C) and triglycerides (TG). However, it remains unclear whether estimated sdLDL-C is associated with the new onset of diabetes mellitus (DM).

Discussion

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Cite This Study

Kawaharata et al. (2026) conducted a cohort in Diabetes Mellitus (n=17,290). High calculated small dense LDL-C (sdLDL-C) and high triglycerides (TG) vs. Low sdLDL-C and low TG was evaluated on New onset of diabetes mellitus (HR 1.54, 95% CI 1.30-1.82, p=<0.001). High calculated small dense LDL-C combined with high triglycerides was associated with a significantly increased risk of developing new-onset diabetes mellitus (HR 1.54).

synapsesocial.com/papers/6ac835407c3139e1cb0e7d4a https://doi.org/10.1253/circrep.cr-26-0098

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Combining Calculated Small Dense Low-Density Lipoprotein Cholesterol With Triglycerides for Refined Stratification of New Onset of Diabetes Mellitus

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Combining Calculated Small Dense Low-Density Lipoprotein Cholesterol With Triglycerides for Refined Stratification of New Onset of Diabetes Mellitus

Key Points

Study Design

Structured PICO

Main Result

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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