Metabolic syndrome: when the risk factors cluster, and how to untangle them

What is metabolic syndrome?

Metabolic syndrome isn’t a single disease. It’s a cluster of risk factors that show up together far more often than chance would predict, because they share a cause: insulin resistance driven by excess fat around the abdomen and organs (visceral fat). Having the cluster raises the risk of heart disease and type 2 diabetes well beyond what any one factor suggests. About 1 in 3 American adults meets the criteria.

The five criteria

You have metabolic syndrome if any three of these apply:

From the 2009 harmonized definition (International Diabetes Federation, American Heart Association, NHLBI and others). *Waist thresholds vary by population; lower cut-points (around 90 cm / 35.5 in for men and 80 cm / 31.5 in for women) are used for many people of Asian descent.

Fatty liver isn’t one of the five criteria, but it travels with them so often that it’s worth checking for. See the fatty liver guide.

Can metabolic syndrome be reversed?

Often, yes, and food is the main tool.

• In an Italian trial of people with metabolic syndrome, those coached on a Mediterranean-style diet (more whole grains, fruit, vegetables, nuts and olive oil) for two years lost about 4 kg on average, and only 44% still met the criteria, versus 87% of the control group.
• In the Diabetes Prevention Program, people with prediabetes who made lifestyle changes (aiming for 7% weight loss and 150 minutes of activity a week) were 41% less likely to develop metabolic syndrome than the placebo group.

How to tackle it with nutrition

1. Lose visceral fat

Because visceral fat drives the whole cluster, steady weight loss is the common lever. Guidelines suggest aiming for 7–10% of body weight over the first year. A DXA scan can measure visceral fat directly so you can see it change. See How to Get Rid of Visceral Adipose Tissue.

2. Eat a Mediterranean- or DASH-style pattern

Build meals on vegetables, fruit, legumes, whole grains, nuts, olive oil and fish. This pattern raises fiber and unsaturated fat and lowers saturated fat, which helps triglycerides, LDL, blood pressure and blood sugar at once.

3. Cut the biggest offenders first

• Sugary drinks, sweets and refined starch, which raise triglycerides and blood sugar.
• Saturated fat (fatty meats, butter, full-fat dairy), which raises LDL and liver fat.
• Sodium, mostly from packaged and restaurant food, which raises blood pressure.
• Alcohol, which raises triglycerides and blood pressure.

4. Move every day, and sleep

Aim for at least 150 minutes of moderate activity a week plus resistance training. Activity improves insulin sensitivity, blood pressure and HDL. Short or poor sleep pushes the other way.

5. Measure what you’re changing

Track your waist, home blood pressure readings and a fasting lipid panel and glucose with your doctor. Seeing several numbers improve together is one of the most motivating parts of the process.

If you take medication for blood pressure, cholesterol or blood sugar, keep taking it as prescribed. As your numbers improve, your doctor may be able to reduce it; never stop or change it on your own.