Triglycerides
A type of fat (lipid) in the blood that the body uses for energy. High triglycerides may increase the risk of heart disease and pancreatitis.
Last updated: April 10, 2026
Triglycerides are the most common type of fat in the body, stored for energy between meals. A normal triglyceride level is below 150 mg/dL — levels above 200 mg/dL are considered high and may increase cardiovascular risk.
Why Are Triglycerides Tested?
Triglycerides are a type of lipid (fat) that circulates in the bloodstream. When calories are consumed but not immediately needed for energy, the body converts them into triglycerides and stores them in fat cells. Between meals, hormones signal the release of triglycerides to provide fuel.
A triglyceride blood test is almost always part of a lipid panel, which also measures total cholesterol, LDL cholesterol, and HDL cholesterol. A healthcare provider may order a triglyceride test to:
- Assess cardiovascular risk — elevated triglycerides contribute to atherosclerosis (plaque buildup in arteries)
- Screen for metabolic syndrome — high triglycerides are one of five criteria used to diagnose this cluster of conditions
- Evaluate pancreatitis risk — very high levels (above 500 mg/dL) can trigger acute pancreatitis
- Monitor the effects of lifestyle changes or medications aimed at lowering lipid levels
- Assess overall metabolic health alongside blood sugar, blood pressure, and waist circumference
The American Heart Association recommends that all adults over age 20 have a lipid panel (including triglycerides) checked every 4–6 years, or more frequently with risk factors such as diabetes, obesity, or a family history of heart disease.
Normal Reference Ranges
These thresholds apply to fasting triglyceride levels and are established by the American Heart Association and National Cholesterol Education Program. Ranges may vary by lab, age, sex, and testing method.
| Category | Triglyceride Level | Interpretation |
|---|---|---|
| Normal | Below 150 mg/dL | Desirable range |
| Borderline High | 150 – 199 mg/dL | May warrant lifestyle changes |
| High | 200 – 499 mg/dL | Increased cardiovascular risk |
| Very High | 500 mg/dL and above | Pancreatitis risk; urgent treatment often needed |
| mg/dL | mmol/L (International Units) |
|---|---|
| 150 mg/dL | 1.7 mmol/L |
| 200 mg/dL | 2.3 mmol/L |
| 500 mg/dL | 5.6 mmol/L |
What Does HIGH Triglycerides Mean?
Elevated triglycerides indicate that more fat is circulating in the bloodstream than the body can efficiently use or store. Over time, high triglycerides contribute to plaque buildup in artery walls, increasing the risk of heart attack and stroke.
Common causes of high triglycerides include:
- Diet high in refined carbohydrates, sugar, and saturated fat — excess calories are converted to triglycerides
- Excess alcohol consumption — even moderate drinking can raise triglyceride levels
- Obesity — particularly excess abdominal fat
- Physical inactivity — sedentary lifestyle reduces the body’s ability to clear triglycerides from the blood
- Type 2 diabetes and insulin resistance — impaired insulin function leads to increased triglyceride production
- Metabolic syndrome — a cluster of conditions including high triglycerides, low HDL, high blood pressure, and elevated blood sugar
Less common causes include:
- Hypothyroidism — an underactive thyroid slows lipid metabolism
- Kidney disease — impaired kidney function can affect lipid clearance
- Liver disease — the liver plays a central role in triglyceride production and regulation
- Medications — beta-blockers, corticosteroids, estrogen, retinoids, and some HIV medications can raise triglycerides
- Familial hypertriglyceridemia — a genetic condition that causes persistently elevated levels regardless of lifestyle
Very high triglycerides (above 500 mg/dL) carry a significant risk of acute pancreatitis — a painful and potentially dangerous inflammation of the pancreas. Levels above 1,000 mg/dL are considered a medical urgency.
What Does LOW Triglycerides Mean?
Low triglyceride levels are generally not a medical concern and often reflect a healthy diet and active lifestyle. There is no established lower limit for triglycerides in standard clinical practice.
However, very low triglycerides (below approximately 35 mg/dL) may occasionally indicate:
- Malnutrition or malabsorption — insufficient caloric or fat intake, or conditions that impair nutrient absorption (celiac disease, Crohn’s disease)
- Hyperthyroidism — an overactive thyroid speeds up metabolism and lipid clearance
- Very low-fat diet — extremely restrictive dietary fat intake
- Rare genetic conditions — such as abetalipoproteinemia, which impairs fat absorption
In most cases, a low triglyceride reading is a positive finding. A healthcare provider would only investigate further if there are other signs of nutritional deficiency or an underlying condition.
Factors That Can Affect Your Results
Triglyceride levels can fluctuate significantly from day to day. Several factors may influence the result:
- Fasting status — this is the most important factor; eating within 9–12 hours before the test can raise triglycerides by 20–30% or more
- Recent meal composition — a high-fat or high-carbohydrate meal the night before can temporarily elevate levels
- Alcohol consumption — even a small amount of alcohol in the days before testing can raise triglycerides
- Exercise — regular physical activity lowers triglycerides over time, but intense exercise right before a test may temporarily affect results
- Weight changes — recent weight gain tends to raise triglycerides; weight loss typically lowers them
- Medications — beta-blockers, diuretics, corticosteroids, estrogen therapy, and retinoids can all increase triglyceride levels
- Pregnancy — triglyceride levels naturally rise during pregnancy, particularly in the second and third trimesters, sometimes doubling or tripling
- Time of day and seasonal variation — levels may be slightly higher in winter and can vary throughout the day
Should I Be Concerned About My Triglyceride Level?
A single borderline-high triglyceride result does not necessarily mean there is a serious health problem. Triglycerides are one of the most variable blood test values and can be influenced by what was eaten the day before, alcohol consumption, or even forgetting to fast before the blood draw.
Results that may warrant closer attention:
- Borderline high (150–199 mg/dL) — often manageable with dietary adjustments, exercise, and limiting alcohol; typically retested in 3–6 months
- High (200–499 mg/dL) — may indicate metabolic syndrome or other underlying conditions; a healthcare provider may recommend lifestyle changes and possibly medication
- Very high (500 mg/dL or above) — carries a real risk of pancreatitis and requires prompt medical evaluation and treatment
- Rising trend over time — even if individual readings are borderline, a consistently upward pattern may signal worsening metabolic health
Triglycerides are most meaningful when interpreted alongside other lipid values, blood sugar, blood pressure, and overall cardiovascular risk factors. A borderline triglyceride level with otherwise healthy markers is far less concerning than the same level combined with high LDL cholesterol, low HDL cholesterol, or elevated blood sugar.
Common Next Steps
Depending on the result and overall risk profile, a healthcare provider may recommend:
- Repeat fasting lipid panel — to confirm the result, especially if fasting was not strictly observed
- Dietary changes — reducing refined carbohydrates, added sugars, and saturated fats; increasing omega-3 fatty acids from fish, walnuts, and flaxseed
- Alcohol reduction or elimination — one of the most effective interventions for lowering triglycerides
- Increased physical activity — regular moderate-intensity exercise, as recommended by a healthcare provider
- Weight management — even modest weight loss can meaningfully lower triglycerides
- Medication — fibrates, prescription omega-3 fatty acids (icosapent ethyl), niacin, or statins for persistent elevations
- Blood sugar evaluation — fasting glucose or A1C testing to check for diabetes or insulin resistance
- Thyroid function test — TSH testing to rule out hypothyroidism as a contributing factor
Frequently Asked Questions
What is a normal triglyceride level?
A normal fasting triglyceride level is below 150 mg/dL (1.7 mmol/L). Levels of 150–199 mg/dL are borderline high, 200–499 mg/dL are high, and 500 mg/dL or above are considered very high. These thresholds are set by the American Heart Association and apply to adults.
What causes high triglycerides?
The most common causes of high triglycerides include a diet rich in refined carbohydrates and sugar, excess alcohol, obesity, physical inactivity, and type 2 diabetes or insulin resistance. Hypothyroidism, kidney disease, and certain medications (beta-blockers, corticosteroids, estrogen) can also elevate levels. In some cases, genetic conditions like familial hypertriglyceridemia are responsible.
Are high triglycerides dangerous?
Persistently high triglycerides contribute to atherosclerosis and increase the risk of heart disease and stroke, especially when combined with high LDL or low HDL cholesterol. Very high levels above 500 mg/dL carry a significant risk of acute pancreatitis, which is a medical emergency. Borderline-high levels are less immediately concerning but should be addressed to prevent progression.
How can triglycerides be lowered?
Effective strategies include reducing refined carbohydrates and added sugars, limiting or eliminating alcohol, increasing physical activity, losing excess weight, and eating more omega-3 rich foods like fatty fish. When lifestyle changes alone are not sufficient, a healthcare provider may prescribe fibrates, prescription omega-3s, or statins.
Do I need to fast for a triglyceride test?
Yes. Fasting for 9–12 hours before a triglyceride test is typically required for accurate results. A recent meal — especially one high in fat or carbohydrates — can temporarily raise triglyceride levels by 20–30% or more. Water and prescribed medications are usually fine to take during the fasting period.
What is the difference between triglycerides and cholesterol?
Both are types of lipids (fats) in the blood, but they serve different purposes. Triglycerides store unused calories and release them as energy between meals. Cholesterol is used to build cell membranes and produce hormones. Both are measured as part of a lipid panel, and elevated levels of either can increase the risk of cardiovascular disease.
Can alcohol raise triglycerides?
Yes. Alcohol is one of the most potent dietary triggers for high triglycerides. The liver prioritizes processing alcohol over other metabolic tasks, which leads to increased triglyceride production. Even moderate drinking can raise levels, and heavy or binge drinking can cause very high or dangerously high triglycerides. Reducing alcohol intake is often one of the fastest ways to see improvement.
What level of triglycerides causes pancreatitis?
Triglyceride levels above 500 mg/dL are associated with an increased risk of acute pancreatitis. The risk becomes substantially higher as levels rise above 1,000 mg/dL. Pancreatitis caused by very high triglycerides is a medical emergency that typically requires hospitalization and aggressive treatment to bring levels down rapidly.
Can exercise lower triglycerides?
Yes. Regular aerobic exercise is one of the most effective non-drug strategies for reducing triglycerides. Research suggests that consistent moderate-intensity activity — such as brisk walking, cycling, or swimming — can meaningfully lower triglycerides over time. The effect is cumulative and tends to improve with consistency over weeks and months. A healthcare provider can help determine what is appropriate for each individual.
What does slightly high triglycerides mean?
Slightly high (borderline) triglycerides of 150–199 mg/dL may reflect dietary habits, weight gain, or early insulin resistance. While not immediately dangerous, borderline levels are a signal to review lifestyle factors — particularly carbohydrate and alcohol intake, physical activity, and body weight. Retesting in 3–6 months after making adjustments can help determine if the elevation is persistent.
Sources
- American Heart Association. Understanding Blood Triglycerides. 2024.
- Mayo Clinic. Triglycerides: Why Do They Matter? 2024.
- National Heart, Lung, and Blood Institute (NHLBI). High Blood Triglycerides.
- MedlinePlus. Triglycerides Test. U.S. National Library of Medicine.
- Endocrine Society. Hypertriglyceridemia Management Guidelines. J Clin Endocrinol Metab.
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Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Reference ranges vary by laboratory and individual factors. Always discuss results with a qualified healthcare provider.