Triglycerides: what is a good level?
Under 150 mg/dL (1.7 mmol/L) is reported as normal on essentially every lab panel worldwide. 150–199 is borderline high. This means a result of 145 mg/dL is returned unflagged.
This is the range used by the atherogenic dial in the Longevity Score calculator. It is deliberately tighter than the range printed on a standard lab report — the reasoning is below.
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A result anywhere in the pale band is reported as normal and generates no comment. The brighter band is where risk is lowest. The distance between them is the part a standard report does not tell you.
What Triglycerides actually measures
Triglycerides are the body's transport and storage form of fat. The measured value reflects what is circulating at that moment, mostly packaged inside VLDL particles made by the liver.
Unlike most lipid markers, triglycerides are strongly state-dependent. They rise after meals and fall with fasting, which makes them as much a readout of recent behaviour as of underlying biology.
Why it matters
A high triglyceride level is rarely the disease itself. It is usually a visible sign of insulin resistance — when insulin signalling fails, the liver exports more triglyceride-rich VLDL.
That excess drives a downstream cascade: triglyceride-rich particles exchange lipids with LDL and HDL, producing small dense LDL particles and lower HDL. This is why high triglycerides, low HDL and raised ApoB so often arrive together.
The ratio of triglycerides to HDL is a widely used proxy for insulin resistance precisely because the two move together for mechanistic reasons, not coincidence.
Why it's on the dashboard
Triglycerides made the panel because a single cheap, fasting-sensitive number doubles as a window into insulin resistance that would otherwise require a separate test to see — which is exactly the kind of signal this dashboard looks for: one input explaining drift in more than one dial. The lifespan case is large and direct: in a Danish cohort of nearly 14,000 adults followed up to 26 years, Nordestgaard et al. (JAMA, 2007) found stepwise-higher nonfasting triglycerides independently predicted myocardial infarction, ischemic heart disease and total mortality. The healthspan case runs through the particles triglycerides generate rather than through triglycerides directly: in a South Korean cohort of over 2.6 million adults, Heo et al. (The Lancet Healthy Longevity, 2024) found higher remnant cholesterol — the cholesterol carried inside the same triglyceride-rich VLDL particles this marker reflects — independently predicted higher rates of vascular dementia and Alzheimer's disease. See the Atherogenic dial for the broader context.
Why this range is stricter than your lab's
The 150 mg/dL threshold identifies people at clear risk of metabolic syndrome and, at much higher levels, pancreatitis. It is a clinical alarm, not a description of optimal.
Metabolically healthy people without insulin resistance typically sit well under 100 mg/dL, and often under 80. The optimised target describes that population rather than the threshold at which concern begins.
Because triglycerides are among the most responsive markers on the panel, a value in the 120s is better read as an early, correctable signal than as an acceptable result.
This distinction applies across the whole panel, not just this marker — see optimal versus standard lab ranges for the general case.
What moves Triglycerides
Educational information, not a treatment plan. Discuss changes to medication or supplementation with a clinician who knows your history.
How fast it responds
Days. Among the fastest-moving markers on the panel — removing alcohol or cutting refined carbohydrate shows up within a week or two, which makes it unusually good for testing whether a change is working. See response times across all markers for how this compares.
What can distort the result
- Fasting matters more here than for any other lipid. A non-fasting sample can read substantially higher, and 12 hours is the convention.
- Alcohol within 2–3 days of the draw can raise the result enough to change its interpretation entirely.
- Uncontrolled diabetes, hypothyroidism, kidney disease and some medications raise triglycerides independently of diet.
- Very high values interfere with the calculation of LDL cholesterol on standard panels, which is one reason ApoB is more robust.
- Day-to-day variability is high. Do not act on a single reading.
Frequently asked questions
What is a good Triglycerides level?
The longevity-optimised target used in this calculator is < 80 mg/dL. Under 150 mg/dL (1.7 mmol/L) is reported as normal on essentially every lab panel worldwide. 150–199 is borderline high. This means a result of 145 mg/dL is returned unflagged.
Why is this target stricter than the range on my lab report?
The 150 mg/dL threshold identifies people at clear risk of metabolic syndrome and, at much higher levels, pancreatitis. It is a clinical alarm, not a description of optimal.
How fast does Triglycerides respond to change?
Days. Among the fastest-moving markers on the panel — removing alcohol or cutting refined carbohydrate shows up within a week or two, which makes it unusually good for testing whether a change is working.
Related markers
Triglycerides feeds the atherogenic dial, and read it alongside Fasting Insulin · ApoB.
Ready to act on it? How to lower Triglycerides ranks the interventions by leverage and says what does not work.