Triglyceride Levels Explained

High triglycerides, especially when coupled with high LDL cholesterol (also known as "bad" cholesterol), might place you at risk of having heart disease. But what are trigylcerides, what is a normal level, and how can the problem be prevented?

medical form with cholesterol and triglyceride lab tests checked
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What Are Triglycerides?

Triglycerides are a type of fat, or lipid, that accounts for the majority of fat in our diets. Triglycerides are important because they provide the body with the energy it needs to function on a daily basis. If you have an excess of triglycerides in the body, they will usually be stored as fat.

Triglycerides are either made in the liver or consumed in the diet and then absorbed into the body through the small intestine.

Additionally, triglycerides never travel to their destination in the body alone. They attach to a protein and become a lipoprotein referred to as a chylomicron or a very-low-density lipoprotein (VLDL).

These lipoproteins are not very dense, or heavy. Therefore, along with low-density lipoproteins (LDL), they run the risk of potentially contributing to heart disease.

What Should My Triglyceride Levels Be?

Elevated levels of triglycerides also are a risk factor for heart disease. According to the U.S. National Library of Medicine:

  • Triglyceride levels should be below 150 mg/dL (1.69 mmol/L).
  • Levels between 150 mg/dL (1.69 mmol/L ) and 199 mg/dL (2.25 mmol/L) are considered borderline high.
  • Levels between 200-499 mg/dL (2.26-5.63 mmol/L) are considered high.
  • Levels above 500 mg/dL (5.64 mmol/L) are considered extremely high.

Risk Factors

There are primary and secondary causes of hypertriglyceridemia or high triglyceride levels. Primary causes include various genetic disorders that affect the metabolism of triglycerides and/or cholesterol. Secondary causes are usually due either to excessive fat in the diet or underlying conditions that would include:

  • Diabetes
  • Metabolic syndrome
  • Obesity
  • Hypothyroidism
  • Excessive alcohol consumption
  • Nephrotic syndrome

If any of these risk factors are present, your healthcare provider probably will recommend that you have a lipid panel performed more frequently (every one or two years as opposed to five years).

Health Effects of High Triglycerides

Having high triglyceride levels may place you at risk for coronary heart disease. However, this fact has not been conclusively proven.

When triglyceride levels are high, most often, LDL levels will be high as well. Elevated LDL levels are an important risk factor for heart disease. However, it has not been fully established that high triglyceride levels alone are capable of producing heart disease.

While there are some studies that have stated that high triglycerides alone are not an independent risk factor for heart disease, there have been other studies that have indicated that triglycerides alone, even with normal LDL and HDL levels, can cause the development of coronary heart disease.


Even though the verdict is still out on whether or not high triglyceride levels alone can cause heart disease, it is still important to restore them back to their normal levels.

High triglyceride levels are initially treated with a low-fat, low-carbohydrate diet and lifestyle modifications. When this does not work, your healthcare provider may want to add medication to help lower your triglyceride levels.

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Article Sources
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  1. Ahmed S, Ahmed O. Biochemistry, lipids.StatPearls. Updated June 3, 2020.

  2. MedlinePlus. Triglycerides.

  3. National Heart, Lung, and Blood Institute. High blood triglycerides.

  4. American Heart Association. Triglycerides: Frequently asked questions. Published April 15, 2011.