- Triglycerides are the main fat stored in your body. A normal level is under 150 mg/dL (1.7 mmol/L).
- The most common drivers are refined carbs, sugar, alcohol and insulin resistance; uncontrolled diabetes, an underactive thyroid and some medicines also raise them.
- Lifestyle changes can lower triglycerides by about 20–50%, often within weeks.
- Levels of 500 mg/dL or more raise the risk of pancreatitis and need prompt medical care.
Triglycerides are the odd one out on a cholesterol report. They are not cholesterol at all. They are the fat your body uses for fuel and stores for later. After a meal, and whenever you take in more energy than you need, your liver and gut pack triglycerides into particles that travel in the blood.
High triglycerides rarely cause symptoms. But they are one of the clearest signs that your metabolism is under strain, and they respond faster to lifestyle changes than almost any other number on your lipid panel.
What your number means
Triglyceride ranges for adults (mg/dL, with mmol/L)
Miller et al., AHA scientific statement, Circulation 2011. The marker shows an example borderline-high result.
Most people no longer need to fast before a lipid test. A non-fasting triglyceride level of 175 mg/dL (2.0 mmol/L) or more is considered raised. If your result is very high, your doctor may repeat it after an overnight fast. For the other numbers on the report, see understanding cholesterol numbers.
Why triglycerides matter
Triglycerides travel in particles called VLDL and chylomicrons. As these particles release their fat, they shrink into “remnants” that carry cholesterol and can enter artery walls, just as LDL does. Large genetic and population studies suggest these triglyceride-rich particles add to heart risk. High triglycerides also tend to come with low HDL, small dense LDL particles and a higher apoB.
At very high levels, usually above 1,000 mg/dL, the risk shifts to the pancreas. Triglycerides this high can trigger acute pancreatitis, a painful and sometimes dangerous inflammation.
What raises triglycerides
White rice in large portions, maida, sweets, biscuits, fruit juice and sugary drinks. The liver turns surplus sugar, especially fructose, into fat.
Even moderate drinking raises triglycerides in some people; heavy drinking can send them very high.
Belly fat, prediabetes and metabolic syndrome make the liver overproduce VLDL.
High blood sugar and low insulin action can push triglycerides into the very high range.
Both slow the clearance of fat-carrying particles.
Including steroids, oral estrogen, some diuretics and beta-blockers, isotretinoin and certain antipsychotics and HIV medicines.
Genes play a part too. Some families have high triglycerides regardless of diet, and a single high-carb, high-alcohol weekend can nudge a borderline result into the high range. If yours is high, it is worth checking blood sugar, HbA1c and thyroid function.
The link with fatty liver
The liver is the factory that makes triglyceride-rich VLDL. When more fat arrives than the liver can export, fat builds up inside liver cells. This is fatty liver disease (MASLD). High triglycerides and fatty liver often travel together, and both are driven by the same things: insulin resistance, excess calories, sugar and alcohol. The AASLD guidance lists high triglycerides as one of the metabolic risk factors that should prompt a check for fatty liver. The upside is that the same changes help both. Read more on the cholesterol, prediabetes and fatty liver connection.
How much lifestyle changes can help
The American Heart Association reviewed the evidence in 2011 and concluded that diet and lifestyle can cut triglycerides by 20–50%. The effects add up when you combine them.
Approximate triglyceride lowering from each change
Miller et al., Circulation 2011. Cutting alcohol and added sugar can lower levels further, especially when they are the main driver.
A short walk after meals also helps your body clear sugar and fat from the blood. See walking after meals for an easy way to start.
Check your waist, not just your weight. Belly fat is closely tied to high triglycerides. Try our Waist-to-Height Ratio Calculator.
What about fish oil?
Omega-3 fats from fish do lower triglycerides, but whether that protects the heart depends on the product. In the REDUCE-IT trial, 8,179 people on statins with raised triglycerides took a purified prescription form of EPA (icosapent ethyl) or a placebo. Heart attacks, strokes and related events fell by 25%. However, the placebo was mineral oil, which may have slightly worsened the comparison group, and the drug raised the risk of atrial fibrillation. A later trial, STRENGTH, used a mixed EPA and DHA product and found no benefit.
Bhatt et al., NEJM 2019. The STRENGTH trial (Nicholls et al., JAMA 2020) of a mixed EPA and DHA product in 13,078 people was stopped early for lack of benefit.
Ordinary fish oil capsules from a pharmacy are not the same as the prescription product and have not been shown to prevent heart attacks. Eating oily fish such as salmon, sardines or mackerel once or twice a week is a sensible food choice. Vegetarians can include walnuts, flaxseed and chia seeds, though these plant omega-3s have less effect on triglycerides.
See a doctor promptly if your triglycerides are 500 mg/dL (5.6 mmol/L) or higher, or if you have severe upper belly pain spreading to the back. Very high levels may need medicine and strict avoidance of alcohol. Do not start prescription omega-3 or other lipid medicines without medical advice.
MythTriglycerides come from eating fat, so a low-fat diet is the fix.
FactFor most people, sugar, refined carbs, alcohol and extra calories raise triglycerides more than dietary fat does. Swapping fat for refined carbs can make them worse.
Common questions
How quickly can triglycerides come down?
Often within 2–4 weeks of cutting sugar, refined carbs and alcohol and moving more. They respond faster than LDL.
Do statins lower triglycerides?
Yes, modestly. Other medicines such as fibrates or prescription omega-3 are used in specific situations; your doctor will decide based on your overall risk.
Can slim people have high triglycerides?
Yes. Many South Asians develop insulin resistance and high triglycerides at a lower body weight than Europeans, often with extra fat around the waist and liver. A diet heavy in rice, sweets and refined flour can raise levels even without weight gain. Waist size is often a better clue than weight.
Is a high reading after a festival meal accurate?
A heavy meal can raise triglycerides for several hours. If a result seems out of character, ask whether a repeat test is needed.
- Triglycerides under 150 mg/dL are normal; 500 or more needs prompt care.
- Sugar, refined carbs, alcohol and insulin resistance are the usual drivers.
- Activity, modest weight loss and better carb choices can cut levels by 20–50%.
- Only a purified prescription EPA showed heart benefit; ordinary fish oil has not.
- Next: ApoB Explained: The Test That Counts Harmful Particles.
Sources
- Miller M, Stone NJ, Ballantyne C, et al. Triglycerides and cardiovascular disease: a scientific statement from the American Heart Association. Circulation. 2011;123(20):2292–2333.
- Bhatt DL, Steg PG, Miller M, et al. Cardiovascular risk reduction with icosapent ethyl for hypertriglyceridemia. N Engl J Med. 2019;380(1):11–22.
- Nicholls SJ, Lincoff AM, Garcia M, et al. Effect of high-dose omega-3 fatty acids vs corn oil on major adverse cardiovascular events in patients at high cardiovascular risk: the STRENGTH randomized clinical trial. JAMA. 2020;324(22):2268–2280.
- Nordestgaard BG, Langsted A, Mora S, et al. Fasting is not routinely required for determination of a lipid profile: clinical and laboratory implications including flagging at desirable concentration cut-points. A joint consensus statement from the European Atherosclerosis Society and European Federation of Clinical Chemistry and Laboratory Medicine. Eur Heart J. 2016;37(25):1944–1958.
- Mach F, Baigent C, Catapano AL, et al. 2019 ESC/EAS Guidelines for the management of dyslipidaemias: lipid modification to reduce cardiovascular risk. Eur Heart J. 2020;41(1):111–188.
- Rinella ME, Neuschwander-Tetri BA, Siddiqui MS, et al. AASLD Practice Guidance on the clinical assessment and management of nonalcoholic fatty liver disease. Hepatology. 2023;77(5):1797–1835.
This article is for general education and is not a substitute for advice from your own doctor or healthcare team.