Is the Triglyceride-to-HDL Ratio a Good Marker of Heart and Metabolic Risk?
Yes, as a warning sign, especially for insulin resistance and metabolic syndrome. In this review of mostly observational studies, a higher triglyceride-to-HDL ratio went with more metabolic syndrome, more coronary plaque and more heart events. There is no single cutoff: values in the studies ranged from about 1.2 to 4.0. Lowering the ratio has not been shown to prevent heart disease.
Dr. Kumar’s Take:
The triglyceride to high-density lipoprotein cholesterol (TG/HDL-C) ratio has emerged as a significant predictor of metabolic syndrome and cardiovascular disease. This study highlights its strong association with insulin resistance, obesity, and heart disease. Understanding your TG/HDL-C ratio can help identify risks early and guide lifestyle interventions to reduce cardiovascular complications.
Brief Summary:
This study investigates the role of the TG/HDL-C ratio in predicting metabolic syndrome (MetS) and cardiovascular disease (CVD). Researchers found that an elevated TG/HDL-C ratio correlates with increased risk for coronary artery disease (CAD), peripheral artery disease (PAD), and cerebrovascular disease (CCVD). The review pulls together findings from many studies, arguing that this lipid marker is a reliable predictor of metabolic and cardiovascular risks.
Key Takeaways:
✔ A high TG/HDL-C ratio is associated with increased risk of metabolic syndrome and cardiovascular diseases.
✔ It serves as an indirect marker for insulin resistance, a key factor in metabolic health.
✔ Different studies suggest varying cutoff values based on ethnicity, gender, and lifestyle factors.
✔ Whether lowering the ratio improves heart outcomes is not proven. Treatments that raise HDL-C on their own have not lowered heart risk.
Study Design:
This is a narrative review. The authors summarized published studies on the TG/HDL-C ratio and metabolic syndrome, coronary artery disease, peripheral artery disease, and cerebrovascular disease. The studies were mostly cross-sectional and cohort designs. The authors did not pool the data into a single analysis.
Results:
✔ Higher TG/HDL-C ratios were linked to an increased risk of metabolic syndrome across multiple populations.
✔ A strong correlation was found between elevated TG/HDL-C ratios and major adverse cardiovascular events (MACE).
✔ In an Iranian study of over 5,000 people, the TG/HDL-C ratio identified metabolic syndrome better than other cholesterol ratios.
✔ Higher ratios were linked to more coronary plaque, coronary calcium, repeat artery-opening procedures, and silent brain infarcts. For stroke the evidence was mixed: after an acute ischemic stroke, a higher ratio was linked to lower 3-month mortality.
✔ Cutoff values differed by study, sex, and population, from about 1.2 to 4.0, so there is no single universal cutoff.
TG/HDL-C Ratio Cutoffs by Sex and Ethnicity:
There is no universal cutoff. Studies in this review used different ones. For example:
✔ Men: One European study linked a ratio above 2.75 to metabolic syndrome and a first coronary event.
✔ Women: The same study used a cutoff of 1.65 for women.
✔ Non-Hispanic Whites & Mexican Americans: A cut-off of 3.0 best predicted high insulin levels (a sign of insulin resistance).
✔ Non-Hispanic Blacks: A lower cut-off of 2.0 best predicted high insulin levels (a sign of insulin resistance).
✔ Multiethnic Populations (Brazilian Study): Suggested cut-off values of 2.6 for men and 1.7 for women for cardiometabolic disorders.
Why the TG/HDL-C Ratio Matters:
The TG/HDL-C ratio is a simple, cost-effective metric that reflects lipid metabolism and cardiovascular risk. Unlike LDL cholesterol, which remains the primary target of statin therapy, this ratio captures residual risk factors related to triglycerides and HDL-C. By incorporating TG/HDL-C monitoring into routine health assessments, physicians can better predict and mitigate cardiovascular risks.
Related Studies and Research
Coronary Artery Calcium and Statin Allocation: Discusses how coronary artery calcium (CAC) scoring influences statin use and refines cardiovascular risk prediction.
LDL Cholesterol, Heart Disease, and the Role of CAC: Evaluates the relationship between LDL cholesterol levels and heart disease risk, with a focus on CAC as a predictor of coronary events.
Frequently Asked Questions
What is a healthy TG/HDL-C ratio?
Lower is better, and I would aim for under 2.0 in men and under 1.7 in women. There is no single agreed cutoff. In one study in this review, ratios above 2.75 in men and above 1.65 in women predicted metabolic syndrome and a first coronary event. Across the studies in this review, risk thresholds ranged from about 1.2 to 4.0 depending on sex and population. A separate 2024 review of 32 studies and 49,782 people suggested average cutoffs for insulin resistance of about 2.8 in men and 2.5 in women (Baneu et al., Biomedicines 2024).
How can I lower my TG/HDL-C ratio?
Lifestyle modifications such as reducing sugar intake, increasing physical activity, consuming healthy fats, and incorporating omega-3 fatty acids can help lower triglycerides and improve HDL-C levels.
Is this ratio a better predictor than LDL cholesterol?
While LDL cholesterol remains a primary focus in heart disease prevention, the TG/HDL-C ratio provides additional insights into metabolic health and residual cardiovascular risk.
Should I be concerned if my ratio is high but my LDL is normal?
Yes, a high TG/HDL-C ratio suggests insulin resistance and atherogenic dyslipidemia, which can increase cardiovascular risk even with normal LDL levels.
Conclusion:
The TG/HDL-C ratio is a powerful yet underutilized marker for assessing metabolic and cardiovascular health. Its strong association with insulin resistance and heart disease risk makes it a valuable tool for both prevention and early intervention. Regular monitoring and proactive lifestyle changes can help mitigate long-term cardiovascular complications.
