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Triglycerides

Triglycerides are a blood fat that responds strongly to diet and alcohol and reflects your metabolic health.

What is Triglycerides?

Triglycerides are the most common type of fat in your body and the form in which your blood transports energy. After a meal your gut packages dietary fat into these particles; between meals your liver makes its own. The value therefore responds strongly to what you have recently eaten, to alcohol, and to how well your metabolism handles fat and sugar. That makes triglycerides one of the most lifestyle-sensitive numbers in a lipid profile — and one of the fastest to move. Read them together with HDL, your triglyceride/HDL ratio, and your glucose markers.

Why is Triglycerides relevant?

A raised fasting triglyceride level is often one of the earliest signs that your body is struggling to clear fat and sugar efficiently. It climbs with insulin resistance, abdominal fat, and fatty liver — frequently before your glucose or HbA1c shift. That makes it a valuable early signal. High triglycerides usually travel with a low HDL, a combination tied to metabolic syndrome and long-term heart and vascular risk. Because the value responds quickly to lifestyle, a downward trend over a few months is one of the clearest signs your metabolic health is genuinely improving.

Triglycerides high or low — what it means

Test fasted where possible (10–12 hours after your last meal), because triglycerides spike for hours after eating. Alcohol the night before or a single heavy meal can skew a reading — so re-test under calm, comparable conditions rather than acting on one surprising value. A high value usually comes from excess abdominal fat, a lot of sugar, refined carbohydrates, or alcohol, or from insulin resistance. The levers work fast: cutting sugar and alcohol, losing weight, exercising, and more omega-3. A repeat after a few months shows whether it is landing. A markedly elevated value deserves medical attention.

Triglycerides reference ranges

Normal (fasting)< 150 mg/dL< 1.7 mmol/L
Borderline150-199 mg/dL1.7-2.2 mmol/L
Elevated200-499 mg/dL2.3-5.6 mmol/L
Clearly high> 500 mg/dL; deserves medical attention> 5.6 mmol/L
Markedly raisedSteeply rising risk of pancreatitis> 10 mmol/L

Reference points for a fasting sample; cut-offs vary between labs and methods. 1 mmol/L is roughly 88.5 mg/dL. For routine assessment, fasting is no longer mandatory under Dutch (NHG/CVRM) and European (ESC/EAS) guidelines; a fasting repeat is only advised when a non-fasting value is markedly raised (rule of thumb above about 5 mmol/L). Triglycerides have no separate male and female reference ranges.

Educational information only — not medical advice. Consult a healthcare professional for clinical decisions.

Read about our scientific approach →Read the guide: Nutrition →

Frequently asked questions

What is a normal triglyceride level?

For a fasting sample, under about 1.7 mmol/L (150 mg/dL) is considered normal, 1.7-2.2 mmol/L (150-199 mg/dL) borderline, and from about 2.3 mmol/L (200 mg/dL) upward elevated. These are reference points, not a diagnosis, and the exact cut-offs vary between laboratories. Always read your value against the range printed on your result.

What does a high triglyceride level mean?

High triglycerides are often an early sign that your body is struggling to clear fat and sugar efficiently: they climb with insulin resistance, abdominal fat, and fatty liver, usually before fasting glucose or HbA1c shift. They commonly travel with a low HDL, a combination tied to metabolic syndrome and heart and vascular risk. Frequent causes include a lot of sugar, refined carbohydrates or alcohol, excess weight, an underactive thyroid, and certain medications.

When is a high triglyceride level a concern?

A value above roughly 5.6 mmol/L (500 mg/dL) counts as clearly elevated and deserves medical attention. The risk of pancreatitis climbs steeply at markedly raised levels, broadly above 10 mmol/L. Persistent elevation should always be reviewed with a clinician.

Is a low triglyceride level bad?

A low triglyceride level is usually no cause for concern; for triglycerides, lower is generally favourable and fits with good metabolic health. Unlike some other blood values, there is no lower limit that signals a problem in itself. With triglycerides, attention is mainly on values that are too high.

How do I lower my triglycerides?

The levers tend to work fast: cutting added sugar, refined carbohydrates and alcohol, losing excess weight, exercising regularly, and increasing omega-3 intake (oily fish or supplementation). It also helps to treat any underlying cause such as poorly controlled diabetes or thyroid disease. Because the value moves quickly, a repeat test after a few months shows whether your changes are landing.

Related biomarkers

HDL Cholesterol
HDL is the 'good' cholesterol that carries excess cholesterol back to your liver.
Triglycerides / HDL Ratio
The triglyceride/HDL ratio divides your triglycerides by your HDL and gives a quick read on your insulin sensitivity.
Glucose (Fasting)
Fasting glucose is your blood sugar after a night without eating and shows how well your body processes glucose.
Hemoglobin A1c
HbA1c shows what your average blood sugar has been over the past two to three months.

Triglycerides is one of the biomarkers in the Optimize blood test. Book a blood draw at any of 238+ partner labs in the Netherlands, or upload your existing results in the app.

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