High triglycerides mean your blood carries more fat than your body can efficiently use or clear, which raises your risk for heart disease and, at very high levels, a painful inflammation of the pancreas. A normal triglyceride level is below 150 mg/dL. Levels between 150 and 199 are considered borderline high, 200 to 499 is high, and anything at or above 500 is very high.
What Triglycerides Actually Are
Triglycerides are the main form of fat circulating in your blood. When you eat more calories than your body needs right away, whether from sugar, fat, or alcohol, your liver packages the excess into triglycerides and sends them into your bloodstream for storage in fat cells. Between meals, hormones release those stored triglycerides back into your blood to fuel your body.
They’re different from cholesterol, even though both show up on the same blood test. Cholesterol is a waxy substance your body uses to build cell walls and make hormones. Triglycerides are purely about energy: storing it when there’s a surplus, releasing it when there’s a deficit. Problems start when the surplus never gets used.
Why High Levels Are Dangerous
The cardiovascular risk from high triglycerides comes down to what carries them through your blood. Triglycerides travel inside particles called VLDL (a cousin of “bad” LDL cholesterol). Remnants of these particles penetrate the walls of your arteries and deposit cholesterol into developing plaques, the same plaques that eventually narrow arteries and cause heart attacks and strokes. Because you spend roughly 18 hours of every day in a fed or partially fed state, your arteries are exposed to these triglyceride-rich remnants for most of your waking life.
The risk isn’t just theoretical. Population studies show that the heart disease danger from triglycerides is concentrated in a specific type of VLDL particle, one carrying a protein called ApoC3. These particles and their remnants are especially good at fueling plaque growth. Nonfasting triglyceride measurements, which capture your blood in this real-world, post-meal state, are actually strong predictors of cardiovascular risk.
The Pancreatitis Threshold
Once triglycerides climb above 500 mg/dL, a different danger emerges: acute pancreatitis. This is a sudden, severe inflammation of the pancreas that causes intense abdominal pain and often requires hospitalization. The risk increases progressively above 500, but it rises sharply past 1,000 mg/dL, where about 5% of people develop an episode. At levels above 2,000 mg/dL, the risk jumps to 10 to 20%. This is the main reason doctors treat very high triglycerides urgently, separate from any concern about heart disease.
Common Causes of Elevated Triglycerides
Diet is the biggest driver for most people, and sugar deserves more blame than dietary fat. When you consume fructose (found in table sugar, high-fructose corn syrup, fruit juice, and sweetened drinks), your liver rapidly absorbs it and converts much of it directly into fatty acids, which get packaged into triglycerides. This pathway is fast and efficient: large amounts of fructose can raise triglyceride levels noticeably within hours. Alcohol follows a similar liver pathway, which is why heavy drinking is one of the most common causes of very high triglycerides.
Beyond diet, several other factors push levels up:
- Insulin resistance and metabolic syndrome. High triglycerides are one of the five defining features of metabolic syndrome, alongside high blood sugar, low HDL cholesterol, high blood pressure, and excess waist circumference. Insulin resistance drives the liver to overproduce triglyceride-rich particles, creating a cycle where excess body fat worsens triglycerides, which in turn signals deeper metabolic trouble.
- Hypothyroidism and hormonal conditions. An underactive thyroid slows the body’s ability to clear triglycerides from the blood. Polycystic ovary syndrome and excess cortisol (whether from medication or a medical condition) can do the same.
- Medications. Certain drugs are well-known triggers: some beta-blockers, thiazide diuretics, corticosteroids, oral estrogen, tamoxifen, second-generation antipsychotics like clozapine and olanzapine, antiretroviral protease inhibitors for HIV, and the chemotherapy drug cyclophosphamide.
- Genetics. Some people inherit a reduced ability to clear triglycerides from their blood, leading to elevated levels even with a reasonable diet. A family history of very high triglycerides or early pancreatitis points in this direction.
Does Fasting Matter for Your Test?
For years, you had to fast for 12 hours before a lipid panel. That’s changing. Guidelines across the U.S., Europe, Canada, and the U.K. now endorse nonfasting blood draws for routine screening. After a typical meal, triglycerides rise by an average of only about 26 mg/dL, a difference that rarely changes clinical decisions. Your doctor cares whether your triglycerides are 180 versus 450, not whether they’re 180 versus 206.
That said, if a nonfasting result comes back elevated, your doctor may ask for a fasting recheck to get a more precise baseline, especially if your levels are near a treatment threshold.
How to Bring Triglycerides Down
Lifestyle changes are the first-line treatment for most people, and they work surprisingly well. Regular aerobic exercise, even moderate-intensity activity like brisk walking, can reduce triglycerides by up to 30%. The effect comes from burning stored triglycerides for fuel and improving your body’s ability to clear them from the blood after meals.
Dietary changes matter just as much. Cutting back on added sugars and refined carbohydrates, especially sugary drinks and desserts, directly reduces the raw material your liver uses to make triglycerides. Reducing alcohol intake can produce dramatic drops in people whose drinking is a major contributor. Replacing refined carbohydrates with fiber-rich foods, vegetables, and healthy fats rounds out the dietary strategy. Losing even a modest amount of weight, if you carry excess, amplifies all of these effects.
When Medication Is Needed
If lifestyle changes aren’t enough, or if levels are high enough to pose a pancreatitis risk, doctors turn to medication. The most commonly used options include fibrates, which lower triglycerides by 30 to 50% depending on your starting level, and prescription-strength omega-3 fatty acids (4 grams per day), which reduce triglycerides by about 20 to 30% in people with high levels and by 30% or more in those with very high levels. These omega-3 doses are far higher than what you’d get from a store-bought fish oil supplement, and they work by reducing the liver’s production and secretion of triglyceride-rich particles. Niacin can also lower triglycerides by 10 to 50%, though it’s used less often today due to side effects.
The Bigger Picture
A single high triglyceride reading isn’t a crisis on its own, but it’s rarely an isolated finding. Elevated triglycerides tend to travel with low HDL cholesterol, insulin resistance, higher blood sugar, and increased belly fat. Together, these form a metabolic pattern that significantly raises your long-term risk of heart disease and type 2 diabetes. Treating triglycerides in isolation misses the point. The real value of catching high triglycerides is that it flags this broader pattern early, when lifestyle changes can still shift the trajectory.