Metabolic syndrome is not a single disease but a cluster of risk factors that travel together and multiply each other's effect: abdominal obesity, elevated blood pressure, high blood sugar, high triglycerides and low HDL.
Underlying the whole cluster is one shared mechanism — insulin resistance, driven by visceral fat. That is why the syndrome is treated not in five different ways but by acting on the cause.
Reference ranges
The diagnosis is made when 3 of 5 criteria are present (IDF/NCEP ATP III):
| 1. Waist circumference | ≥ 94 cm (men) / ≥ 80 cm (women) |
| 2. Triglycerides | ≥ 1.7 mmol/L |
| 3. HDL | < 1.0 (men) / < 1.2 (women) mmol/L |
| 4. Blood pressure | ≥ 130/85 mmHg |
| 5. Fasting glucose | ≥ 5.6 mmol/L |
What an elevated level means
Having metabolic syndrome roughly doubles the risk of cardiovascular events and increases the risk of developing type 2 diabetes several-fold.
It is also closely linked to non-alcoholic fatty liver disease, polycystic ovary syndrome, sleep apnea, chronic kidney disease and several types of cancer.
The key idea: the danger of the syndrome lies not in individual "slightly elevated" markers but in their combination. Three borderline values together are more dangerous than one that is far off.
What a low level means
Having none of the criteria is a favorable picture: insulin sensitivity is preserved and cardiometabolic risk is low.
Keep in mind that the criteria are thresholds, not a "safe zone". A waist of 93 cm in a man is formally not a criterion, but it is already closer to risk than 80 cm. Look at the trend, not just whether you "cross" the line.
How the test is done
You need: waist circumference, blood pressure and three fasting blood tests — glucose, triglycerides, HDL.
The waist is measured in the morning fasting, standing, on exhalation, midway between the lowest rib and the iliac crest. Blood — strictly fasting, 12 hours (for lipids). Blood pressure — at rest, the average of 2–3 readings.
What affects the value
- Visceral fat — the root of the whole cluster.
- Physical inactivity — reduces insulin sensitivity.
- Refined carbohydrates, sugar and alcohol — raise triglycerides and glucose.
- Lack of sleep and chronic stress — amplify insulin resistance.
- Age and menopause — shift fat toward the abdominal type.
- Genetics — affects predisposition but does not predetermine the outcome.
Calculate using this marker
Calculators where Metabolic syndrome is used directly:
Frequently asked questions
I have 2 of 5 criteria — is that already the syndrome?
Formally no, the diagnosis requires three. But that is no reason to relax: two criteria mean the process is already underway. This is the best point to intervene — at this stage everything is reversible without medication.
Can metabolic syndrome be reversed?
Yes, and that is the main thing to know about it. Losing 5–10% of body weight (especially visceral fat) together with regular exercise can remove several criteria at once — because it targets the shared cause, insulin resistance.
Why does the waist matter more than weight?
Because the criterion is not total weight but abdominal obesity specifically. Metabolic risk is created by visceral fat around the organs, and waist circumference reflects it far better than BMI.
Related terms
Sources
- MedlinePlus (NIH) — Metabolic Syndrome
- American Heart Association — Metabolic Syndrome
- International Diabetes Federation