Metabolic syndrome: criteria, risks and how to reverse it (factor by factor)
The five criteria for metabolic syndrome with their numbers in both units, why it doubles cardiovascular risk, and what has been shown to reverse it.
5 min readEducational content by RejuvelookUpdated in October 2026
In short
You have metabolic syndrome if you meet three of five criteria: a large waist, high triglycerides, low HDL cholesterol, raised blood pressure and raised fasting glucose. It affects almost a third of adults in Spain and doubles cardiovascular risk. Because the five factors share a cause, weight loss and lifestyle change improve several at once.
Key points
- Diagnosis requires three of five internationally harmonised criteria, each with a specific number.
- In Spain, 31% of adults aged 35 to 74 meet the criteria for metabolic syndrome.
- It is linked to twice the rate of cardiovascular disease and 50% higher mortality.
- Losing 5 to 10% of body weight improves triglycerides, HDL, blood pressure and glucose.
- In Spain's PREDIMED study, a Mediterranean diet with nuts made reversal of the syndrome more likely.
Metabolic syndrome is not a single disease but a cluster of problems that tend to travel together and, together, weigh more than they do apart. It has clear criteria, it is measured with simple tests and, to a large extent, it can be reversed.
What metabolic syndrome is
It is the combination of several risk factors for heart disease and type 2 diabetes that occur together more often than chance would explain: abdominal fat, high triglycerides, low HDL cholesterol, raised blood pressure and raised glucose [1]. Behind them there is usually one engine: excess abdominal fat and insulin resistance.
It is very common. In the DARIOS study of over 24,000 adults across ten Spanish regions, 31% of people aged 35 to 74 met the criteria [2]. Worldwide, the figure ranges from 12.5% to 31.4% of adults depending on the definition, and almost half have a raised waist measurement [8].
The five criteria and their numbers
In 2009 the main international societies agreed a harmonised definition. Metabolic syndrome is diagnosed with any three of these five criteria, none of them compulsory [1]:
- Raised waist circumference, with cut-offs that depend on population. For people of European origin, the most widely used thresholds are 94 cm (37 in) or more for men and 80 cm (31.5 in) or more for women.
- Triglycerides of 150 mg/dL (1.7 mmol/L) or more, or treatment to lower them.
- HDL cholesterol below 40 mg/dL (1.0 mmol/L) in men or 50 mg/dL (1.3 mmol/L) in women, or treatment to raise it.
- Blood pressure of 130/85 mmHg or more, or treatment for high blood pressure.
- Fasting glucose of 100 mg/dL (5.6 mmol/L) or more, or treatment for raised glucose.
The statement adds that waist measurement remains a useful first screening tool [1]. For the glucose side, our guide to prediabetes and insulin resistance goes into detail.
Why it matters: risks that add up
A meta-analysis of 87 studies and nearly a million people found that metabolic syndrome is linked to twice the rate of cardiovascular disease and 50% higher all-cause mortality. The risk stayed high even in people without diabetes [3].
It also affects the liver. Since 2023, what used to be called non-alcoholic fatty liver disease has been renamed metabolic dysfunction-associated steatotic liver disease (MASLD). Its definition now requires at least one of five cardiometabolic risk factors, very close to those of the syndrome [4].
How it is diagnosed and assessed
Diagnosis is simple: a tape measure, a blood pressure cuff and a blood test for glucose and lipids. What matters is what comes next: estimating your overall cardiovascular risk. European prevention guidelines use tools such as SCORE2, which combine age, sex, smoking, blood pressure and cholesterol [7]. In the UK your GP may have used a different calculator, so do not be surprised if the figures differ. Two people with metabolic syndrome can have very different risks.
Your waist deserves more attention than it gets. An international consensus calls it a vital sign, because it reflects abdominal fat better than weight does [9], and European obesity guidelines consider that reducing it may matter more than weight loss itself [10].
What has evidence behind it
Because the five factors share a cause, tackling it improves several at once. In the Look AHEAD study, losing 5 to 10% of body weight was linked to improvements in glucose, blood pressure, triglycerides and HDL cholesterol [5].
Food matters, and the Mediterranean pattern has its own data. In Spain's PREDIMED trial, a Mediterranean diet enriched with nuts made reversal of metabolic syndrome more likely than a low-fat diet, with no change in physical activity required [6]. On the Costa del Sol, the ingredients are close at hand.
In practice, what usually moves the whole picture is:
- Losing weight and keeping it off, with particular attention to your waist.
- Cutting back on sugary drinks, alcohol and ultra-processed food, which weigh heavily on triglycerides.
- Moving every day and adding two or three strength sessions a week.
- Sleeping enough and stopping smoking. When one factor stays high despite all this, such as blood pressure or cholesterol, treatment is considered according to your overall risk [7]. Our guide to medical weight loss in Spain explains how the weight side is approached.
What the evidence says
Each statement shows its level of evidence and the sources behind it.
Supported
With caveats
Not enough support
- Supplements and products that claim to boost metabolism: no evidence that they reverse the syndrome.Low-quality evidence
What to expect, realistically
Reversing metabolic syndrome does not require reaching an ideal weight. It requires sustained change and repeated measurements. Some factors respond quickly, like triglycerides, and others more slowly, like waist size. That is why they are measured the same way each time, at the same time of day and with the same lab where possible, so comparisons are fair.
The goal is not to scrape out of the diagnosis by a narrow margin, but to bring your overall risk down and keep it there.
Risks, and who this is not for
Crash diets and fat-burning supplements have no evidence behind them and can backfire. If you have an eating disorder, are pregnant or have a serious illness, the approach needs a different team or specific adaptations.
How it works at Rejuvelook
Metabolic syndrome is managed within our weight and metabolic health programme, online anywhere in Spain and in person in Fuengirola, in English or Spanish. It starts with a medical video consultation and, if needed, blood tests at a lab near you.
The doctor looks at the whole picture, estimates your cardiovascular risk and proposes a staged plan with measurable goals: waist, weight, body composition, blood pressure and blood markers. Reviews are regular and reports are available in English for your GP at home. If any factor needs medication, it is assessed individually and monitored.
When to see a doctor
Book a medical consultation, or go to A&E if it is severe or sudden, if you notice:
- Chest pain or tightness, breathlessness, sudden weakness or difficulty speaking: call 112 straight away.
- Very high blood pressure at home with a severe headache, blurred vision or confusion: go to A&E (urgencias).
- Strong thirst, passing a lot of urine or unexplained weight loss: diabetes may already be present.
- You have been told you have a fatty liver or abnormal liver tests and nobody has explained what to do next.
Frequently asked
How do I measure my waist at home?
Standing, with your stomach relaxed, halfway between your lowest rib and the top of your hip bone, at the end of a normal breath out. Measure against the skin and always in the same place.
My UK results are in mmol/L and the Spanish ones in mg/dL. Which criteria apply?
The same criteria, in different units. This guide gives both. Bring your previous reports and the doctor will compare them directly.
I already take medication for blood pressure or cholesterol. Does that count?
Yes. The criteria count a factor as present if you are being treated for it, even when the number is now under control.
How long does it take to improve?
Triglycerides and glucose can improve within weeks of sustained change; waist and weight take longer. Progress is checked at regular reviews, using the same measurements each time.
Can I be followed up remotely?
Yes. The programme runs online anywhere in Spain, in English or Spanish, with blood tests at a lab near you, and in person in Fuengirola.
Is metabolic syndrome the same as diabetes?
No. One of its criteria is raised fasting glucose, but diabetes has its own thresholds. People with metabolic syndrome are, however, more likely to develop diabetes, which is why it is monitored.
Do I need a liver scan?
Not always. It depends on your blood results and your risk. If the doctor thinks it would help, it will be requested.
References
Sources checked against PubMed or Crossref. Cited as plain text, without links.
- 1.Alberti KG, Eckel RH, Grundy SM, Zimmet PZ, Cleeman JI, Donato KA, et al. Harmonizing the metabolic syndrome: a joint interim statement of the International Diabetes Federation Task Force on Epidemiology and Prevention; National Heart, Lung, and Blood Institute; American Heart Association; World Heart Federation; International Atherosclerosis Society; and International Association for the Study of Obesity. Circulation. 2009;120(16):1640-5. doi: 10.1161/CIRCULATIONAHA.109.192644. PMID: 19805654.Verified on 2 October 2026
- 2.Fernández-Bergés D, Cabrera de León A, Sanz H, Elosua R, Guembe MJ, Alzamora M, et al. Metabolic syndrome in Spain: prevalence and coronary risk associated with harmonized definition and WHO proposal. DARIOS study. Rev Esp Cardiol (Engl Ed). 2012;65(3):241-8. doi: 10.1016/j.recesp.2011.10.015. PMID: 22305818.Verified on 2 October 2026
- 3.Mottillo S, Filion KB, Genest J, Joseph L, Pilote L, Poirier P, et al. The metabolic syndrome and cardiovascular risk a systematic review and meta-analysis. J Am Coll Cardiol. 2010;56(14):1113-32. doi: 10.1016/j.jacc.2010.05.034. PMID: 20863953.Verified on 2 October 2026
- 4.Rinella ME, Lazarus JV, Ratziu V, Francque SM, Sanyal AJ, Kanwal F, et al. A multisociety Delphi consensus statement on new fatty liver disease nomenclature. Hepatology. 2023;78(6):1966-1986. doi: 10.1097/HEP.0000000000000520. PMID: 37363821.Verified on 2 October 2026
- 5.Wing RR, Lang W, Wadden TA, Safford M, Knowler WC, Bertoni AG, et al. Benefits of modest weight loss in improving cardiovascular risk factors in overweight and obese individuals with type 2 diabetes. Diabetes Care. 2011;34(7):1481-6. doi: 10.2337/dc10-2415. PMID: 21593294.Verified on 2 October 2026
- 6.Salas-Salvadó J, Fernández-Ballart J, Ros E, Martínez-González MA, Fitó M, Estruch R, et al. Effect of a Mediterranean diet supplemented with nuts on metabolic syndrome status: one-year results of the PREDIMED randomized trial. Arch Intern Med. 2008;168(22):2449-2458. doi: 10.1001/archinte.168.22.2449. PMID: 19064829.Verified on 2 October 2026
- 7.Visseren FLJ, Mach F, Smulders YM, Carballo D, Koskinas KC, Bäck M, et al. 2021 ESC Guidelines on cardiovascular disease prevention in clinical practice. Eur Heart J. 2021;42(34):3227-3337. doi: 10.1093/eurheartj/ehab484. PMID: 34458905.Verified on 2 October 2026
- 8.Noubiap JJ, Nansseu JR, Lontchi-Yimagou E, Nkeck JR, Nyaga UF, Ngouo AT, et al. Geographic distribution of metabolic syndrome and its components in the general adult population: A meta-analysis of global data from 28 million individuals. Diabetes Res Clin Pract. 2022;188:109924. doi: 10.1016/j.diabres.2022.109924. PMID: 35584716.Verified on 2 October 2026
- 9.Ross R, Neeland IJ, Yamashita S, Shai I, Seidell J, Magni P, et al. Waist circumference as a vital sign in clinical practice: a Consensus Statement from the IAS and ICCR Working Group on Visceral Obesity. Nat Rev Endocrinol. 2020;16(3):177-189. doi: 10.1038/s41574-019-0310-7. PMID: 32020062.Verified on 2 October 2026
- 10.Durrer Schutz D, Busetto L, Dicker D, Farpour-Lambert N, Pryke R, Toplak H, et al. European Practical and Patient-Centred Guidelines for Adult Obesity Management in Primary Care. Obes Facts. 2019;12(1):40-66. doi: 10.1159/000496183. PMID: 30673677.Verified on 2 October 2026
Educational content. It does not replace a medical consultation or provide a diagnosis. Tests and treatments are indicated only after medical consultation and in line with regulation.