Triglycerides: What Your Results Mean
Triglycerides are the most common type of fat in your blood. Your body converts excess calories — especially from sugar, refined carbs, and alcohol — into triglycerides and stores them in fat cells. Normal is below 150 mg/dL, optimal is below 100. High triglycerides are a major, independent risk factor for heart disease and at very high levels (>500) can trigger acute pancreatitis.
What Are Triglycerides?
Every time you eat more calories than your body needs immediately, the excess gets packaged into triglycerides — three fatty acid chains attached to a glycerol backbone. These molecules travel through your blood in VLDL particles (very-low-density lipoprotein) produced by the liver, and get deposited in fat tissue for later use.
Between meals and during exercise, hormones signal fat cells to release triglycerides back into the blood for energy. This is normal physiology. The problem starts when the inflow consistently exceeds the outflow: triglyceride levels climb, VLDL particles multiply, and the resulting small, dense LDL particles they create are particularly good at burrowing into artery walls.
Triglycerides are tested as part of a standard lipid panel, always after a 9–12 hour fast. Non-fasting levels can be 20–30% higher and are harder to interpret. A single meal high in fat or alcohol can spike triglycerides for 12+ hours, which is why fasting is important.
Reference Ranges
| Classification | Range (mg/dL) |
|---|---|
| Optimal | Below 100 |
| Normal | 100 – 149 |
| Borderline High | 150 – 199 |
| High | 200 – 499 |
| Very High | 500+ |
Important: Triglycerides respond faster to lifestyle changes than any other lipid marker. Significant drops can happen in 2–4 weeks with dietary changes alone. But they also spike dramatically from a single binge — one heavy drinking night can push triglycerides above 500 temporarily.
What Causes High Triglycerides?
- Diet — sugar, refined carbs, and alcohol are the biggest drivers. Fructose is especially potent because the liver converts it directly into triglycerides. Fruit juice, soda, white bread, and beer are common culprits.
- Insulin resistance / metabolic syndrome — when cells don't respond well to insulin, the liver overproduces VLDL. This is why high triglycerides often cluster with high blood sugar, low HDL, and abdominal obesity.
- Obesity — excess fat tissue releases more free fatty acids, which the liver repackages as triglycerides.
- Physical inactivity — exercise burns triglycerides directly. Sedentary lifestyles let them accumulate.
- Uncontrolled diabetes — type 2 diabetes with poor glucose control frequently causes triglycerides above 300.
- Hypothyroidism — thyroid hormone regulates lipid metabolism. Low thyroid slows triglyceride clearance.
- Medications — beta-blockers, corticosteroids, estrogen therapy, tamoxifen, retinoids, and some HIV medications can raise triglycerides.
- Kidney disease — nephrotic syndrome causes the liver to overproduce lipoproteins.
- Genetics — familial hypertriglyceridemia can cause levels above 500 even with a healthy lifestyle.
When triglycerides exceed 500 mg/dL, the risk of acute pancreatitis rises sharply. Above 1,000, it becomes a medical emergency. At these levels, treatment focuses on immediate triglyceride reduction before addressing other cardiovascular risk factors.
What Causes Low Triglycerides?
Low triglycerides (below 50 mg/dL) are uncommon and usually not harmful. Possible causes include:
- Very low-fat diet or malnutrition
- Malabsorption — celiac disease, Crohn's disease
- Hyperthyroidism — overactive thyroid accelerates fat metabolism
- Genetic conditions — abetalipoproteinemia (rare)
Triglycerides vs. Other Lipid Tests
| Test | What It Measures |
|---|---|
| Triglycerides | Fat from excess calories — most diet-responsive lipid marker |
| LDL Cholesterol | Primary driver of plaque buildup — the "main target" for heart disease prevention |
| HDL Cholesterol | Removes cholesterol from arteries — higher is protective |
| Total Cholesterol | Sum of all cholesterol — less useful than individual components |
| VLDL | Carries triglycerides in blood — estimated as triglycerides ÷ 5 |
| Non-HDL Cholesterol | Total minus HDL — captures all atherogenic particles including triglyceride-rich ones |
The triglyceride/HDL ratio is a powerful predictor of insulin resistance and cardiovascular risk. A ratio below 2.0 is ideal. Above 3.5 suggests metabolic syndrome and small, dense LDL particles even if your LDL number looks normal.
Look Up Your Triglycerides Result
Select your value below to see a detailed breakdown:
Optimal
Normal
Borderline High
High
Very High
Read the Full Cholesterol Guide
Frequently Asked Questions
Below 150 mg/dL is considered normal, but below 100 mg/dL is optimal. The difference matters: research shows cardiovascular risk starts climbing above 100, not 150. If your triglycerides are 130 and your doctor calls them "normal," they technically are — but lower would be better for long-term heart health.
Several non-dietary factors raise triglycerides: genetics (familial hypertriglyceridemia), insulin resistance even at normal weight, hypothyroidism, certain medications (beta-blockers, corticosteroids), and kidney disease. Also, "healthy" diets high in fruit juice, honey, or refined grains can still drive triglycerides up because fructose and simple carbs convert directly to triglycerides in the liver.
Triglycerides are the most diet-responsive lipid marker. Cutting sugar, refined carbs, and alcohol can produce measurable drops in 2–4 weeks. Adding 30 minutes of daily exercise accelerates this. For very high levels (500+), prescription omega-3 (icosapent ethyl) or fibrates may be needed alongside diet changes.
Divide your triglycerides by your HDL cholesterol. A ratio below 2.0 is ideal and suggests good insulin sensitivity and large, buoyant LDL particles. A ratio above 3.5 strongly predicts insulin resistance, metabolic syndrome, and small dense LDL — even if your LDL cholesterol number looks "normal." Many cardiologists consider this ratio more predictive than LDL alone.
