The puzzle of triglycerides

Triglycerides are another piece of the heart-risk puzzle, but they play a different role than LDL cholesterol. They're not cholesterol at all. They're fats your body uses for energy storage. When levels stay high, it's usually a signal that your metabolism isn't handling sugar and carbs well. The good news: triglycerides are the most responsive number on your lipid panel. Diet and exercise alone can cut them dramatically.

What are triglycerides?

Triglycerides are a type of fat in your blood. When you eat more calories than your body needs right away, it converts the excess into triglycerides and stores them in fat cells. Between meals, hormones release triglycerides for energy.

A standard lipid panel measures triglycerides alongside your cholesterol numbers. But triglycerides aren't cholesterol. They're an energy reserve. When they stay elevated, it means your body is consistently taking in more fuel than it can use, especially from sugar, refined carbs, and alcohol.

What's a normal triglyceride level?

Your triglyceride level is measured from a blood draw, ideally after fasting for 9 to 12 hours. Here's how to read your number:

Why do high triglycerides matter?

High triglycerides rarely act alone. They're usually part of a cluster of problems called metabolic syndrome, which includes high blood sugar, high blood pressure, low HDL (the "good" cholesterol), and excess belly fat. About one in three U.S. adults has metabolic syndrome, and elevated triglycerides are one of its defining features.

Triglycerides travel through your blood inside particles called VLDL (very low-density lipoprotein). As those particles break down, they leave behind remnants that can lodge in artery walls and drive plaque buildup. Research shows these remnant particles can deliver up to four times more cholesterol to artery walls than regular LDL particles.

What causes high triglycerides?

Unlike LDL, which is strongly influenced by genetics, high triglycerides are most often driven by what you eat and drink. The biggest culprits:

How can you lower triglycerides?

This is where the story gets encouraging. Triglycerides respond to lifestyle changes faster and more dramatically than almost any other number on your lipid panel. Here's what the research shows:

• Cut sugar and refined carbs. These are the single biggest dietary driver. Reducing them can lower triglycerides by 20–30%.
• Lose 5–10% of body weight. If you're overweight, even modest weight loss can drop triglycerides by about 20%. For every kilogram lost, triglycerides fall roughly 2%.
• Exercise regularly. Aerobic exercise like brisk walking, cycling, or swimming for 30 minutes most days lowers triglycerides significantly.
• Limit alcohol. Even moderate amounts raise triglycerides. Cutting back or stopping entirely can produce noticeable results.
• Eat more omega-3 fats. Fatty fish like salmon, sardines, and mackerel contain omega-3s that help lower triglycerides.

When lifestyle changes aren't enough, or when levels are very high (500+ mg/dL), your doctor may recommend medication. Icosapent ethyl (a prescription omega-3) reduced major cardiovascular events by 25% in a large clinical trial. Fibrates are sometimes used for very high levels to prevent pancreatitis. These are conversations to have with your doctor based on your full risk picture.

What's the connection to ApoB and particle risk?

Here's a part of the puzzle that often goes unnoticed. When triglycerides are high, your liver produces more small, dense LDL particles. These smaller particles are more dangerous because they penetrate artery walls more easily. A standard lipid panel measures the amount of cholesterol inside LDL, but it doesn't count how many particles you have. That's where ApoB comes in.

ApoB counts the total number of particles that can cause plaque, including those small dense LDL particles that high triglycerides create. If your triglycerides are borderline or high, your LDL number alone may underestimate your risk. Asking your doctor for an ApoB test gives you the fuller picture. And a coronary CT angiogram can show whether plaque has already started forming in your arteries.

When should you get tested?

This guide is for educational purposes and is not medical advice. Please consult your doctor for personalized recommendations.

Triglycerides are included in a standard lipid panel, so they're checked anytime your cholesterol is tested. Adults should have a lipid panel at least every 4 to 6 years, or more often if levels are elevated or you have risk factors.

Fasting for 9 to 12 hours before the test gives the most accurate triglyceride reading. Non-fasting tests are acceptable for general screening, but if your non-fasting level comes back above 175 mg/dL, your doctor may want a fasting retest. If your levels are elevated, ask about an ApoB test and a calcium score to understand your full cardiovascular picture.

The bottom line

Triglycerides are a window into how well your metabolism is working. High levels signal that sugar, carbs, or calories are outpacing what your body can burn. The empowering part: this is one of the numbers you have the most control over. Diet and exercise changes can produce meaningful drops in weeks, not months.