High Triglycerides: What It Means

Published Aug 2026 · Reading time: 4 minutes

The short answer:High triglycerides are one of the most common lipid flags — and one of the most responsive to lifestyle. The usual causes are extra calories, sugar and refined carbs, alcohol, and low activity. A single high reading is often partly the meal you ate the day before, which is why the retest is done fasting. Don't panic; this number usually moves within weeks of cutting sugar and alcohol and moving more.

First, what are triglycerides?

Triglycerides are the body's main way of storing spare energy. When you eat more than you burn — especially sugar and refined carbs — the liver packages the surplus into triglycerides and ships them through your blood. That's what the test is counting.

A common reference range is below 1.7 mmol/L (150 mg/dL); some labs list it up to 2.3 mmol/L (200 mg/dL) as borderline. Compare against the range on your own report.

Where your number sits

🟢 Borderline high (1.7–2.3 mmol/L / 150–199 mg/dL): The "lifestyle zone." Diet and activity changes usually bring this down within weeks.

🟡 High (2.3–5.6 mmol/L / 200–499 mg/dL): Worth a real conversation with your doctor — especially if your blood sugar or blood pressure is also flagged.

🔴 Very high (over ~5.6 mmol/L / 500 mg/dL): See your doctor promptly; this level can raise the risk of pancreas problems and usually needs treatment, not just diet.

The everyday causes

Sugar and refined carbs. The single biggest dietary lever — more than fat itself.
Alcohol. Even moderate regular drinking raises triglycerides.
Extra weight. Especially weight carried around the middle.
Low activity. Triglycerides drop with regular movement.
Other conditions. Underactive thyroid and some medications can raise the number — check the TSH guide if your thyroid is also flagged.

Your follow-up plan

Retest fasting (typically 9–12 hours, water only) in 4–8 weeks. In between: cut sugary drinks and refined carbs, keep alcohol to a minimum, and add brisk walking most days. If your fasting glucose or HbA1c is also up, read them together — see our HbA1c guide and cholesterol guide.

What to do next

Don't ignore a very high number. Do: retest fasting, cut sugar and alcohol for a month, and move daily. Triglycerides respond faster to lifestyle than almost any other number on your report — often visible on the very next test.

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