Metabolic Syndrome
healthA cluster of conditions occurring together — high blood pressure, high blood sugar, excess waist fat, abnormal cholesterol/triglycerides — that increase risk of heart disease, stroke, and diabetes.
Definition
A cluster of conditions occurring together — high blood pressure, high blood sugar, excess waist fat, abnormal cholesterol/triglycerides — that increase risk of heart disease, stroke, and diabetes. Affects ~25% of adults globally.
What Is Metabolic Syndrome?
Metabolic syndrome is not a single disease but a cluster of interrelated metabolic abnormalities that together substantially increase the risk of cardiovascular disease, type 2 diabetes, and non-alcoholic fatty liver disease. According to the most widely used diagnostic criteria (the International Diabetes Federation and American Heart Association consensus), metabolic syndrome is diagnosed when a person has three or more of the following five criteria:
| Criterion | Threshold |
|---|---|
| Waist circumference | 102 cm or more (men) / 88 cm or more (women) |
| Triglycerides | 150 mg/dL or more, or on medication |
| HDL cholesterol | Less than 40 mg/dL (men) / less than 50 mg/dL (women) |
| Blood pressure | 130/85 mmHg or more, or on medication |
| Fasting glucose | 100 mg/dL or more, or on medication |
Approximately 25–35% of adults in high-income countries meet criteria for metabolic syndrome, with prevalence rising sharply with age and obesity.
Underlying Mechanisms
Insulin resistance and central (visceral) obesity are considered the core drivers linking the five components. Excess visceral fat releases free fatty acids into the portal circulation, promoting hepatic triglyceride synthesis and dyslipidemia (high triglycerides, low HDL). Chronic low-grade inflammation from adipose tissue further impairs insulin signaling and endothelial function, elevating blood pressure. These components amplify each other in a self-reinforcing cycle.
Dietary and Lifestyle Management
No single dietary pattern reverses all five components, but several strategies address the syndrome comprehensively. The Mediterranean diet and the DASH diet each reduce multiple metabolic risk factors simultaneously in clinical trials. Key nutritional priorities include:
- Weight reduction: 5–10% loss of body weight improves all five criteria; even 3 kg of visceral fat loss measurably reduces triglycerides and blood pressure
- Refined carbohydrate restriction: reducing added sugar below 25 g per day (women) or 36 g per day (men) lowers triglycerides by 20–30 mg/dL on average
- Omega-3 fatty acids: 2–4 g of EPA+DHA per day reduces triglycerides by 15–30%
- Dietary fiber: at least 25–38 g per day supports glycemic control, LDL reduction, and satiety
- Sodium restriction: limiting sodium to less than 2,300 mg per day assists blood pressure management
- Physical activity: 150 minutes per week of moderate aerobic activity improves insulin sensitivity and HDL cholesterol
Related Guides
Anti-Inflammatory Diet: Foods That Fight Chronic Inflammation
How to use food to reduce chronic inflammation — the science behind an anti-inflammatory eating pattern.
Reverse Dieting: How to Increase Calories Without Gaining Fat
The evidence-based strategy of slowly increasing calories after a diet to restore metabolism without fat regain.
Sleep and Weight: How Poor Sleep Sabotages Weight Loss
The hormonal mechanisms linking sleep deprivation to weight gain — ghrelin, cortisol, and metabolic disruption.
Hormones and Weight Management: Insulin, Leptin, and More
How insulin, leptin, ghrelin, thyroid, and cortisol hormones regulate body weight and how nutrition influences them.
Related Terms
Visceral Fat
Fat stored within the abdominal cavity around internal organs (liver, pancreas, intestines).
Inflammation
The immune system's protective response to injury or infection.
Insulin Resistance
A condition where cells fail to respond normally to insulin, requiring the pancreas to produce more insulin to maintain blood sugar.
Hypertension
Chronically elevated blood pressure (≥130/80 mmHg per 2017 ACC/AHA guidelines).