Triglycerides are a type of fat circulating in your bloodstream that your body uses as its primary energy reserve. Every time you eat more calories than you immediately need, your body converts the excess into triglycerides and stores them in fat cells for later use. A normal triglyceride level is less than 150 mg/dL, and levels above that threshold start raising your risk for heart disease and other problems.
How Triglycerides Work in Your Body
Each triglyceride molecule is built from a glycerol backbone with three fatty acids attached to it. When you eat a meal, your body takes whatever calories it doesn’t burn right away and packages them into these molecules, which travel through your blood to fat tissue for storage. Think of triglycerides as your body’s savings account for energy: calories go in when you have a surplus, and they get withdrawn when you need fuel.
That withdrawal process kicks in during fasting, exercise, or any period when your body needs more energy than it’s getting from food. Hormones like glucagon and adrenaline signal your fat cells to break triglycerides back down into their component parts, which then travel to muscles and organs to be burned as fuel. This system works well when intake and expenditure are roughly balanced. Problems start when the deposits consistently outpace the withdrawals.
Triglycerides vs. Cholesterol
Both triglycerides and cholesterol are fats in your blood, but they do very different jobs. Triglycerides store energy. Cholesterol is a structural molecule your body uses to build cell membranes, produce hormones, and make bile for digesting food. They also travel through your blood differently: cholesterol rides on particles called LDL and HDL, while triglycerides hitch a ride on their own set of particles (called triglyceride-rich lipoproteins, or remnants).
Your doctor measures both on the same blood test, a lipid panel, because both contribute to cardiovascular risk. But they’re separate numbers that can move independently. You can have normal cholesterol and high triglycerides, or vice versa.
What Healthy and Unhealthy Levels Look Like
- Normal: Less than 150 mg/dL
- Borderline high: 150 to 199 mg/dL
- High: 200 to 499 mg/dL
- Very high: 500 mg/dL and above
Your triglyceride level is typically measured after an overnight fast of 9 to 12 hours. Eating before the test can inflate the number by around 15%, since your body is still processing calories from your last meal. Some doctors now accept non-fasting lipid panels for general screening, but if your triglycerides come back elevated on a non-fasting test, you’ll likely be asked to repeat it fasting for a more accurate reading.
What Causes High Triglycerides
The most common driver is simply eating more calories than your body burns, especially from refined carbohydrates and sugar. Your liver converts excess carbs into triglycerides very efficiently, which is why a diet heavy in white bread, sugary drinks, and sweets can push levels up even if you’re not eating much fat. Alcohol has a similar effect: it’s processed by the liver in a way that ramps up triglyceride production.
Beyond diet, several other factors play a role. Obesity, high blood sugar, and elevated insulin levels all tend to raise triglycerides. Certain medications, including some birth control pills, can increase them. Hypothyroidism and poorly controlled diabetes are common medical causes. And genetics matter: if heart disease or high triglycerides run in your family, you’re more likely to have elevated levels yourself, even with a reasonable diet. Familial hypertriglyceridemia is a genetic condition where inherited variants combine with lifestyle factors to push levels significantly higher than normal.
Why High Triglycerides Are Dangerous
Elevated triglycerides contribute to heart disease, though the mechanism is more nuanced than most people realize. The triglyceride-rich particles in your blood carry cholesterol with them. When these “remnant” particles penetrate the walls of your arteries, they deposit that cholesterol inside the artery lining. Immune cells called macrophages gobble up the cholesterol, become bloated “foam cells,” and form the fatty plaques that narrow arteries over time.
These remnant particles are especially problematic for two reasons. First, each one carries up to 40 times as much cholesterol as an LDL particle, so even a small number of them can deliver a large cholesterol payload into artery walls. Second, unlike LDL cholesterol, remnant cholesterol triggers low-grade inflammation in the arteries, which accelerates plaque buildup. Research from the American Heart Association has shown that high remnant cholesterol is associated with both inflammation and ischemic heart disease, while LDL cholesterol drives plaque formation without the same inflammatory component.
At extremely high levels, triglycerides create a separate danger: acute pancreatitis. The risk begins climbing above 1,000 mg/dL, where roughly 5% of people will develop an episode of pancreatitis. At levels above 2,000 mg/dL, the risk jumps to 10 to 20%. This is a painful and potentially life-threatening inflammation of the pancreas that requires hospitalization.
Lowering Triglycerides Through Lifestyle
Lifestyle changes are the first and most effective approach. Combining a healthier diet, regular exercise, and weight loss can lower triglycerides by more than 50%. You don’t need a dramatic transformation to see results: losing just 5% to 10% of your body weight makes a measurable difference.
The dietary changes that matter most are reducing added sugars, refined carbohydrates, and alcohol. Swapping white rice and sugary snacks for whole grains, vegetables, and lean protein lowers the raw material your liver uses to manufacture triglycerides. Cutting back on alcohol, or eliminating it entirely, removes another major production trigger. Regular aerobic exercise helps by burning triglycerides directly for fuel and improving your body’s ability to clear them from the bloodstream.
When Medication Becomes Necessary
If lifestyle changes aren’t enough, or if levels are dangerously high, doctors turn to medication. Fibrates are the most commonly prescribed drug class for high triglycerides, lowering levels by 30% to 50% depending on how elevated they are to start. Statins, which most people associate with cholesterol, also reduce triglycerides by 10% to 30%. Prescription-strength omega-3 fatty acids, taken as four capsules daily providing over 3 grams of active compounds, work by reducing the liver’s production of triglyceride-rich particles and improving the body’s ability to clear them from the blood.
The choice of medication depends on your overall lipid profile and cardiovascular risk. Someone with both high triglycerides and high LDL cholesterol might start with a statin, while someone whose triglycerides are the primary concern might benefit more from a fibrate or prescription omega-3. Over-the-counter fish oil supplements contain far lower doses of the active fatty acids than prescription versions and are not a reliable substitute for managing clinically high levels.