Triglycerides are a type of fat in your blood that your body uses as its primary form of energy storage. When you eat more calories than you need, your liver converts the excess into triglycerides, which are then packed into your fat cells for later use. A standard blood test called a lipid panel measures them, and a healthy level for adults is below 150 mg/dL.
Most people first encounter the word on a lab report, often alongside cholesterol numbers. But triglycerides and cholesterol are different things. Cholesterol is used to build cells and hormones. Triglycerides are fuel reserves. When levels stay elevated over time, they contribute to serious health problems, particularly heart disease and inflammation of the pancreas.
What Triglycerides Do in Your Body
Triglycerides are an efficient, compact form of energy. Because they’re hydrophobic (they repel water), triglyceride molecules pack together tightly in fat tissue, storing a large amount of energy in a small space. Between meals or during exercise, your body breaks these fat stores down and releases triglycerides into your bloodstream, where cells can use them for fuel.
The problem isn’t having triglycerides. You need them. The problem is having too many circulating in your blood because you’re consistently taking in more energy than your body burns. That surplus keeps triglyceride levels elevated, and over time, the excess contributes to fatty buildup in artery walls and puts strain on organs like the pancreas and liver.
What the Numbers on Your Lab Report Mean
Triglyceride levels are measured in milligrams per deciliter (mg/dL). The National Heart, Lung, and Blood Institute breaks them 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
Extremely high levels, above roughly 1,500 mg/dL, can cause the body to stop breaking down fats properly, a condition called multifactorial chylomicronemia syndrome.
Fasting vs. Non-Fasting Tests
Triglyceride testing has traditionally required fasting for 9 to 12 hours beforehand, because eating a meal temporarily spikes levels. Current guidelines from the American College of Cardiology are more flexible: for a routine screening in someone who isn’t already on cholesterol-lowering medication, a non-fasting sample is generally acceptable. A non-fasting triglyceride reading above 200 mg/dL, combined with low HDL cholesterol and elevated blood sugar markers, is enough to start a conversation about treatment.
Fasting tests are still recommended in specific situations: if you have a family history of genetic lipid disorders, if you’re already taking a statin or other lipid-lowering medication, or if you’ve had pancreatitis. When levels are extremely high (around 1,000 mg/dL or more), there’s no need to repeat the test fasting before starting treatment.
What Raises Your Triglycerides
The biggest dietary driver is excess calories, particularly from refined carbohydrates. Foods made with white flour, added sugars, and fructose are especially potent at pushing triglycerides up because your liver readily converts these simple carbs into fat. Regularly eating more calories than you burn, regardless of the source, keeps levels elevated.
Alcohol deserves special attention. Drinking with a fatty meal amplifies triglyceride spikes dramatically. In one study, eating a high-fat meal raised triglycerides by about 70%, but combining the same meal with alcohol raised them by 180%. This effect is strongest with saturated fat. Alcohol slows the breakdown of fat particles in your blood and simultaneously stimulates your liver to produce more of them. Moderate drinking may not raise fasting levels in most people, but heavy or chronic drinking often causes persistently high triglycerides even between meals.
Several medical conditions also raise triglycerides independently of diet. The most common are obesity, type 2 diabetes, and fatty liver disease. Hypothyroidism, kidney disease, and conditions involving chronic inflammation like rheumatoid arthritis and lupus can contribute as well. Pregnancy naturally raises triglyceride levels, particularly in the second and third trimesters.
Certain medications push levels up too. Steroids like prednisone, some blood pressure medications (particularly certain diuretics and beta blockers), antipsychotic medications like clozapine and olanzapine, acne treatments containing retinoids, and immune-suppressing drugs used after organ transplants all have this effect. If your triglycerides climbed after starting a new medication, that connection is worth discussing with whoever prescribed it.
Health Risks of High Triglycerides
Elevated triglycerides are an independent risk factor for cardiovascular disease. They contribute to atherosclerosis, the gradual narrowing of arteries, and are closely linked to the cluster of problems known as metabolic syndrome (high blood sugar, excess abdominal fat, high blood pressure, and abnormal cholesterol).
The more immediate danger at very high levels is acute pancreatitis, a painful and potentially life-threatening inflammation of the pancreas. The risk rises sharply once triglycerides exceed 1,000 mg/dL. Among people with levels between 1,000 and 1,999 mg/dL, roughly 10% develop acute pancreatitis. Above 2,000 mg/dL, that number doubles to about 20%. If the underlying cause isn’t addressed, repeated bouts of pancreatitis can lead to chronic damage, causing problems with digestion and eventually diabetes as the pancreas loses function.
How to Lower Your Levels
Exercise is one of the most effective tools. A single session of aerobic exercise can lower circulating triglycerides by roughly 30% by increasing how quickly your body clears fat from the bloodstream (about 22% faster) and reducing how much your liver pumps out (about 17% less). Interestingly, research shows this effect comes specifically from the energy expenditure of exercise. Simply cutting the same number of calories from your diet without exercising doesn’t produce the same short-term triglyceride reduction, suggesting that physical activity has a unique metabolic benefit beyond just creating a calorie deficit.
Dietary changes matter for the long term. The most impactful steps are cutting back on refined carbohydrates and sugars, replacing saturated fats (from red meat, butter, and full-fat dairy) with unsaturated fats (from olive oil, nuts, avocados, and fatty fish), and limiting or eliminating alcohol. If your levels are in the “very high” range, avoiding alcohol entirely is important because even moderate amounts can trigger dangerous spikes.
When lifestyle changes aren’t enough, medications come into play. Prescription omega-3 fatty acids can reduce triglycerides by 20 to 30%. Niacin (vitamin B3) in extended-release form can lower them by 20 to 50%, though its overall benefit and safety profile have been questioned. Newer therapies are also in development that target specific proteins involved in triglyceride metabolism, offering potential options for people with genetic conditions that keep levels dangerously high despite diet and exercise.
Most people with borderline or moderately high triglycerides can bring their numbers into the healthy range with consistent exercise, dietary adjustments, and moderate weight loss. The changes show up on blood work relatively quickly, often within weeks of sustained effort, since triglycerides respond faster to lifestyle shifts than cholesterol typically does.