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# Metabolic Syndrome

met·a·bol·ic syn·drome - met-ah-BOL-ik SIN-drome

## Definition

[Metabolic syndrome](/conditions/metabolic-syndrome) is not a single disease but a cluster of interconnected metabolic abnormalities that significantly increase the risk of heart disease, stroke, and [type 2 diabetes](/conditions/type-2-diabetes). A person is diagnosed with metabolic syndrome when they have at least three of five specific risk factors: elevated waist circumference (abdominal obesity), high triglycerides, low HDL cholesterol, [high blood pressure](/glossary/hypertension), and elevated fasting [blood sugar](/glossary/blood-glucose).

These five risk factors are not independent - they tend to occur together and share a common underlying driver: [insulin resistance](/glossary/insulin-resistance). When cells become resistant to [insulin](/glossary/insulin)'s effects, the body compensates in ways that raise blood pressure, alter [cholesterol](/glossary/cholesterol) profiles, promote abdominal fat accumulation, and elevate blood sugar. This cluster of changes creates a metabolic environment that dramatically accelerates [cardiovascular](/glossary/cardiovascular) disease.

Metabolic syndrome is alarmingly prevalent. An estimated 34% of American adults - over 84 million people - meet the criteria. Prevalence increases sharply with age, affecting more than 50% of adults over 60. The condition is strongly associated with excess weight, physical inactivity, and genetic predisposition, but can also develop in individuals who appear lean but carry excess visceral (internal) fat.

## Also Known As

Syndrome X Insulin resistance syndrome Cardiometabolic syndrome 

## Key Facts

-   • You need 3 of 5 criteria for diagnosis: large waist, high triglycerides, low HDL, high blood pressure, high fasting glucose. 
-   • Having metabolic syndrome doubles your risk of heart disease and increases diabetes risk fivefold. 
-   • An estimated 34% of American adults have metabolic syndrome - over 84 million people. 
-   • Insulin resistance is considered the central driver linking all five components of the syndrome. 
-   • Lifestyle intervention (diet, exercise, weight loss) is the first-line treatment and can reverse metabolic syndrome in many cases. 
-   • The Mediterranean diet has been shown to reduce the prevalence of metabolic syndrome by 25% in clinical trials. 

## How It Relates To Your Health

If you've been told you have metabolic syndrome or have several of its component risk factors, understanding the condition as a unified problem - not just a collection of individual issues - is important. Treating the underlying [insulin resistance](/glossary/insulin-resistance) and [inflammation](/glossary/inflammation) through lifestyle changes addresses all five risk factors simultaneously, which is more effective than treating each one individually.

The good news is that [metabolic syndrome](/conditions/metabolic-syndrome) is highly responsive to lifestyle intervention. Regular physical activity, dietary improvements (particularly reducing refined carbohydrates and increasing whole foods), weight loss of 5-10%, stress management, and adequate sleep can reverse metabolic syndrome in many cases, dramatically reducing [cardiovascular](/glossary/cardiovascular) and diabetes risk.

## Related Terms

[Insulin Resistance](/glossary/insulin-resistance)[Cholesterol](/glossary/cholesterol)[Hypertension](/glossary/hypertension)[HbA1c](/glossary/hba1c)[Inflammation](/glossary/inflammation)

## Related Conditions

[

### Type 2 Diabetes

Digestive 

Type 2 diabetes is a metabolic disorder in which the body becomes resistant to insulin or doesn't produce enough insulin to maintain normal blood sugar levels. Chronically elevated blood sugar damages blood vessels, nerves, and organs throughout the body.

Increased thirst and frequent urination Unexplained weight loss Blurred vision 

Chronic Learn More 

](/conditions/type-2-diabetes)[

### Polycystic Ovary Syndrome

Endocrine 

PCOS is a hormonal disorder causing enlarged ovaries with small cysts on the outer edges. It leads to irregular menstrual periods, excess androgen levels, and difficulty conceiving. PCOS is also associated with insulin resistance, weight gain, and an increased risk of type 2 diabetes.

Irregular or missed periods Excess facial and body hair Acne 

Chronic Learn More 

](/conditions/polycystic-ovary-syndrome)[

### Metabolic Syndrome

Endocrine 

Metabolic syndrome is a cluster of interconnected conditions - elevated blood pressure, high blood sugar, excess body fat around the waist, and abnormal cholesterol levels - that occur together and dramatically increase the risk of heart disease, stroke, and type 2 diabetes.

Large waist circumference High blood pressure Elevated blood sugar 

Chronic Learn More 

](/conditions/metabolic-syndrome)

## Related Articles

[![The Mediterranean Diet: A Complete Beginner's Guide](https://images.unsplash.com/photo-1498837167922-ddd27525d352?w=1200&h=630&fit=crop&fm=webp)](/nutrition/mediterranean-diet-beginners-guide)

[](/nutrition/mediterranean-diet-beginners-guide)[Nutrition & Diet](/nutrition)

### The Mediterranean Diet: A Complete Beginner's Guide

2026-01-20

[![Intermittent Fasting: What the Science Actually Says](https://images.unsplash.com/photo-1504674900247-0877df9cc836?w=1200&h=630&fit=crop&fm=webp)](/nutrition/intermittent-fasting-science)

[](/nutrition/intermittent-fasting-science)[Nutrition & Diet](/nutrition)

### Intermittent Fasting: What the Science Actually Says

2025-09-01

## Sources

1.  [Metabolic Syndrome](https://www.nhlbi.nih.gov/health/metabolic-syndrome) - National Heart, Lung, and Blood Institute (NIH)
2.  [Metabolic syndrome](https://www.mayoclinic.org/diseases-conditions/metabolic-syndrome/symptoms-causes/syc-20351916) - Mayo Clinic
3.  [About Metabolic Syndrome](https://www.heart.org/en/health-topics/metabolic-syndrome/about-metabolic-syndrome) - American Heart Association

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