High triglycerides means your blood contains more than 150 mg/dL of triglycerides, the most common type of fat in your body. At that level, your risk of heart disease starts climbing. Above 500 mg/dL, the risk of a painful and potentially dangerous inflammation of the pancreas rises sharply. Most people with high triglycerides have no symptoms at all, which is why the condition is typically caught on a routine blood test.
What Triglycerides Actually Do
Triglycerides are your body’s main form of stored energy. When you eat more calories than you need right away, whether from sugar, fat, or alcohol, your body converts the excess into triglycerides and tucks them into fat cells for later use. Between meals, hormones signal the release of those triglycerides back into the bloodstream so your cells can burn them for fuel.
This makes triglycerides different from cholesterol, which your body uses to build cell membranes and hormones. Both travel through your blood packaged inside tiny protein-wrapped particles called lipoproteins, but they serve fundamentally different purposes. You need both, but problems start when triglyceride levels stay elevated over time.
The Numbers That Matter
The National Heart, Lung, and Blood Institute breaks triglyceride levels into four categories:
- Healthy: Below 150 mg/dL for adults (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 and above
These numbers come from a fasting blood test, which remains the standard. Eating in the hours before a blood draw raises triglyceride levels temporarily, so most labs ask you to fast for 10 to 12 hours beforehand. A nonfasting reading of 175 mg/dL or higher is also considered elevated and worth following up on.
Why High Triglycerides Are Dangerous
Elevated triglycerides contribute to the buildup of fatty deposits inside artery walls, increasing the risk of heart attack and stroke. This risk is compounded because high triglycerides rarely travel alone. They tend to show up alongside low “good” cholesterol, high blood sugar, excess belly fat, and elevated blood pressure, a cluster known as metabolic syndrome.
The more immediate danger at very high levels is pancreatitis, an inflammation of the pancreas that causes severe abdominal pain, nausea, and sometimes hospitalization. The risk correlates directly with how high the numbers go. Above 500 mg/dL, pancreatitis becomes a real concern. Above 1,500 to 2,000 mg/dL, the risk rises dramatically. Keeping levels below 500 mg/dL, and ideally below 250 mg/dL, is generally enough to prevent this complication.
What Causes Levels to Rise
The most common driver is simply consuming more calories than your body uses, especially from sugar, refined carbohydrates, and alcohol. Your body is efficient at converting these into triglycerides. In a counterintuitive twist, eating a high-carbohydrate diet can raise blood fat levels even when you’re cutting fat from your food. When carbohydrates make up more than about 55% of your total calories, your liver ramps up its production of triglycerides, a phenomenon researchers call carbohydrate-induced hypertriglyceridemia.
Alcohol has a particularly strong effect. Even moderate drinking can push triglycerides up, and heavy drinking can send them into the very high range quickly. Excess body weight, especially fat carried around the midsection, is another major contributor because it promotes insulin resistance, which disrupts how your body handles fats.
Several medical conditions also raise triglycerides independently. Type 2 diabetes and insulin resistance are among the most common culprits. The underlying mechanism is that insulin-resistant cells release more fatty acids into the bloodstream, which the liver then packages into triglyceride-rich particles. Underactive thyroid, kidney disease, and certain medications (including some blood pressure drugs and steroids) can also push levels up. In people with type 1 diabetes, poor blood sugar control raises triglycerides, but getting glucose well managed typically brings them back to normal.
Genetics play a role too. Some people inherit conditions that impair their body’s ability to clear triglycerides from the blood, leading to persistently high levels even with a healthy lifestyle.
Symptoms You Might Notice
High triglycerides typically cause no symptoms, which is why they can go undetected for years. Physical signs only appear when levels are extremely elevated. The most distinctive is eruptive xanthomatosis: small, pea-sized bumps that appear on the skin, usually on the buttocks, shoulders, arms, and legs. These bumps range from yellow to orange-red, feel firm and waxy, and may have a red halo around them. They can be itchy or tender. While the bumps themselves are harmless, they signal that triglyceride levels are dangerously high and need attention.
How Diet and Lifestyle Lower Triglycerides
Lifestyle changes are the first and most effective treatment for most people with high triglycerides. The American College of Cardiology recommends 150 minutes per week of moderate exercise (like brisk walking) or 75 minutes of vigorous exercise, along with enough weight loss to drop 5% to 10% of body weight. For someone weighing 200 pounds, that’s 10 to 20 pounds.
Dietary changes depend on how high your levels are. For moderate elevations (150 to 499 mg/dL), the focus is on cutting refined carbohydrates, limiting foods with a high glycemic index (especially fructose and starches), reducing saturated fat, and increasing protein. Total fat doesn’t need to be severely restricted, but the type of fat matters. For severe elevations (500 mg/dL and above), the dietary approach is more aggressive: total fat intake needs to drop to 20 to 30 grams per day, which is a significant restriction that typically requires guidance from a dietitian.
Alcohol should be limited in anyone with elevated triglycerides and eliminated entirely when levels are markedly high.
When Medication Is Needed
For people with mild to moderate elevations who don’t have heart disease or diabetes, lifestyle changes alone are generally sufficient. Medication enters the picture in specific situations: when triglycerides remain above 500 mg/dL despite lifestyle changes (to prevent pancreatitis), or when someone already has heart disease or diabetes and needs additional risk reduction.
The main medication options include prescription omega-3 fatty acids and a class of drugs called fibrates, both of which lower triglycerides by roughly similar amounts. One important distinction the American Heart Association emphasizes: prescription omega-3 products are not the same as over-the-counter fish oil supplements you’d find at a drugstore. The prescription versions deliver a standardized, high dose that has been tested in clinical trials. Store-bought fish oil supplements vary widely in quality and potency, and guidelines specifically recommend against substituting them for prescription formulations when treating high triglycerides.
If you already have heart disease or diabetes with persistently elevated triglycerides, a specific prescription form of purified EPA (one of the omega-3 fatty acids) has been shown to reduce cardiovascular events beyond what standard treatments achieve alone.