High triglycerides on a blood test mean your blood contains more fat than your body can efficiently use or clear. A healthy level is below 150 mg/dL, and anything above 200 mg/dL raises your risk for heart attack and stroke. Your result falls into one of four categories, and where you land determines how aggressively you and your doctor need to act.
What Triglycerides Actually Are
Triglycerides are the main form of fat your body uses for long-term energy storage. When you eat more calories than you need, especially from sugars, refined carbohydrates, or alcohol, your liver converts the excess into triglycerides. These fats travel through your bloodstream packaged inside particles called lipoproteins, eventually reaching fat cells for storage or muscle cells for fuel.
This system works well when intake and usage stay in balance. Problems start when your body produces more triglycerides than it can clear, or when clearance slows down. The excess stays circulating in your blood, and that’s what shows up as a high number on your lipid panel.
What Your Numbers Mean
The National Heart, Lung, and Blood Institute classifies triglyceride levels into four ranges:
- Healthy: Below 150 mg/dL (below 90 mg/dL for children and teens ages 10 to 19)
- Borderline high: 150 to 199 mg/dL
- High: 200 to 499 mg/dL
- Very high: 500 mg/dL or above
Borderline numbers are a signal to examine your diet and lifestyle. Once you cross 200 mg/dL, the cardiovascular risks become meaningful. People with triglycerides above 200 mg/dL are 25% more likely to die from cardiovascular disease than someone with normal levels, according to Cleveland Clinic data. Very high levels (above 500 mg/dL) introduce an additional danger: acute pancreatitis, a painful and potentially life-threatening inflammation of the pancreas.
Why High Triglycerides Are Dangerous
Triglycerides don’t directly stick to artery walls the way cholesterol particles do, but they create the conditions for plaque to build up. When your body breaks down triglyceride-rich particles, it leaves behind remnants that trigger inflammation inside your arteries. That inflammation attracts other particles that do stick, gradually narrowing the vessels. This process, atherosclerosis, can develop in arteries supplying blood to your heart, brain, or limbs.
Over time, plaque buildup in these different locations leads to coronary artery disease, carotid artery disease, or peripheral artery disease. Any of these can eventually cause a heart attack or stroke if left untreated. The relationship is dose-dependent: the more triglycerides circulating in your blood, the more likely atherosclerosis is to develop.
At extremely high levels, the risks shift. Once triglycerides exceed 1,000 mg/dL, the chance of developing pancreatitis reaches about 10%. Above 5,000 mg/dL, that risk climbs past 50%. Below 1,000 mg/dL, triglyceride-caused pancreatitis is unlikely.
Common Causes of High Triglycerides
Diet is the most frequent driver. Excess sugar, refined carbohydrates, and alcohol all push your liver to produce more triglycerides. Alcohol can also slow down the clearance of dietary fat from your bloodstream, compounding the problem. Eating more calories than you burn, regardless of the source, gives your liver more raw material to convert into triglycerides.
Several medical conditions also raise levels independently of diet. These include type 2 diabetes, insulin resistance, hypothyroidism, kidney disease, liver disease, metabolic syndrome, and obesity. Autoimmune conditions like lupus and rheumatoid arthritis can contribute as well. If your triglycerides are high and your diet is reasonable, one of these underlying conditions may be the explanation, and treating it often brings triglycerides down on its own.
Some medications raise triglycerides as a side effect, and genetics play a role too. Certain inherited conditions cause the body to overproduce triglycerides or clear them poorly, sometimes leading to very high levels even in people who eat well and exercise.
Fasting vs. Non-Fasting Tests
You may have been told to fast for 9 to 12 hours before a lipid panel, but current guidelines from the European Atherosclerosis Society state that fasting is not routinely required. Non-fasting blood draws are now considered acceptable for standard screening because they reflect how your body handles fat under real-world conditions, not just in a controlled fasting state.
That said, if a non-fasting triglyceride result comes back above 440 mg/dL, a follow-up fasting test is typically recommended to get a more precise reading. Fasting also becomes more important when doctors are trying to diagnose a specific genetic lipid disorder. For routine screening, though, a non-fasting sample is reliable and far more convenient, especially for children, people with diabetes, and anyone who finds fasting difficult.
How to Lower High Triglycerides
Lifestyle Changes
For borderline or moderately high levels, lifestyle changes are the first line of defense. Cutting back on added sugars and refined carbohydrates has the most direct impact, since these are what your liver preferentially converts into triglycerides. Reducing alcohol intake helps too, particularly if you drink regularly. Losing even a modest amount of weight improves triglyceride clearance, and regular physical activity, both cardio and resistance training, helps your muscles burn triglycerides for fuel instead of leaving them in circulation.
Replacing saturated fats with unsaturated fats (from fish, nuts, olive oil) and increasing fiber intake also help. These changes can produce noticeable drops in triglyceride levels within weeks, especially when combined.
Medications
When lifestyle changes aren’t enough, or when levels are very high, medications come into play. The most effective class, fibrates, can lower triglycerides by 30% to 50%. Niacin (a form of vitamin B3) can achieve 20% to 50% reductions in its immediate-release form. Statins, more commonly associated with cholesterol, also reduce triglycerides by 10% to 30%. Prescription-strength omega-3 fatty acids at high doses can lower triglycerides by 20% to 30%, with higher doses consistently outperforming lower ones in clinical studies.
Your doctor will choose a medication based on how high your triglycerides are, what other lipid problems you have, and your overall cardiovascular risk profile. For very high levels (above 500 mg/dL), the immediate goal is bringing triglycerides down fast enough to prevent pancreatitis, so medication is typically started right away alongside dietary changes.
What to Watch For Going Forward
High triglycerides rarely cause noticeable symptoms until levels become extremely elevated. At very high levels, some people develop small fatty deposits under the skin or notice a whitish ring around the iris. Severe spikes can cause abdominal pain from pancreatitis. For most people, though, the only way to know your triglycerides are elevated is through a blood test, which is why repeat testing matters.
If your result came back high, expect your doctor to recheck your levels after you’ve had time to make changes, typically in 2 to 3 months. Triglycerides respond relatively quickly to dietary shifts compared to other lipid markers, so you can often see meaningful improvement on a follow-up test. Tracking the trend over time gives a better picture than any single reading.