Metabolic syndrome is on the rise: What it is and why it matters

Metabolic syndrome may be the most common and serious condition you’ve never heard of. (At least that’s what I found out when I asked friends and relatives about it.) Worse, a study published recently in JAMA shows that it’s on the rise.

Let’s start with the name, according to Merriam-Webster:

Metabolic: Relating to the chemical changes in living cells by which energy is provided for vital processes and activities and new material is assimilated

Syndrome: A group of signs and symptoms that occur together and characterize a particular abnormality or condition.

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So now you know what metabolic syndrome is, right? Perhaps not. Just knowing what the words in its name mean doesn’t help much in this case.

Metabolic syndrome defined

According to the most widely accepted definition, a person has metabolic syndrome when at least three of the following are present:

• Obesity: A body mass index (BMI) of 30 or above, or a large waistline (greater than 40 inches in men or 35 inches in women)
• Elevated blood triglycerides (a type of fat in the blood): Above 150 mg/dL
• Low HDL (good) cholesterol: Below 40 mg/dL in men or 50 mg/dL in women
• High blood pressure: 130 mmHg or above (systolic pressure), or 85 mmHg or above (diastolic pressure), or previously diagnosed hypertension that requires medication
• Elevated blood sugar: A fasting plasma glucose level of 100 mg/dL or above, or taking diabetes medications.

Why having metabolic syndrome matters

While each component of metabolic syndrome can cause health problems on its own, a combination of them powerfully increases the risk of having

• cardiovascular disease (including heart attacks and stroke)
• diabetes
• liver and kidney disease
• sleep apnea

And this only a partial list. It’s likely we’ll learn about other health risks associated with metabolic syndrome in the future.

Metabolic syndrome is on the rise

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A new study explores how common metabolic syndrome is and who is getting it. Researchers analyzed survey data from more than 17,000 people who were representative of the US population in gender, race, and ethnicity. While the overall prevalence of metabolic syndrome increased slightly between 2011 and 2016 — going from 32.5% to 36.9% — it increased significantly among

• women (from 31.7% to 36.6%)
• adults ages 20 to 39 (from 16.2% to 21.3%)
• Asian (from 19.9% to 26.2%) and Hispanic (from 32.9% to 40.4%) adults.

Rates of metabolic syndrome were similar among men and women, but increased with age (from about one in five in young adults to nearly half of all people over 60). Among Hispanic adults 60 and over, nearly 60% had metabolic syndrome.

Perhaps these findings should not be surprising given the connection between obesity and metabolic syndrome, and the well-documented epidemic of obesity in this country. Still, it is particularly worrisome that metabolic syndrome is rising so fast among certain ethnic groups and young adults, and there is currently little reason to think these trends won’t continue in the near future.

Health disparities in metabolic syndrome

The finding that metabolic syndrome is more common among certain ethnic groups reveals significant health disparities. These disparities are important not only in the context of long-term health consequences, but also because of the current pandemic. Some components of metabolic syndrome, such as obesity and hypertension, are associated with more severe COVID-19. Separately, research shows higher rates of infection, hospitalization, and deaths from COVID-19 among some racial and ethnic groups.

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For example, hospitalization rates for COVID-19 among Blacks and Hispanics are four to five times higher than for non-Hispanic white people. Health disparities associated with COVID-19 may reflect a complex combination of elements — not just age and chronic medical conditions, but also genetic, social, environmental, and occupational factors. Similar factors probably play a role in why metabolic syndrome affects, and is rising in, some groups more than others. This is an area of active (and much needed) research.

What’s to be done about metabolic syndrome?

The biggest priority now regarding metabolic syndrome is prevention. Healthy habits can have a big impact on maintaining a healthy weight and normal blood sugar, lipid levels, and blood pressure. Once present, metabolic syndrome can be treated with loss of excess weight, improved diet (such as the Mediterranean diet or the DASH diet), and, when necessary, with medications (including those that can improve blood lipids, or lower blood pressure or blood sugar).

The bottom line

Metabolic syndrome is an important risk factor for some of the most common and deadly conditions, including cardiovascular disease and diabetes. We need to figure out how to more effectively prevent and treat it, particularly because it appears to be on the rise. A good starting point is to pay more attention to risk factors such as excess weight, lack of exercise, and an unhealthy diet.

Now you know what metabolic syndrome is. Considering that about one in three people in the US has this condition, it’s likely someone close to you has it. Talk to your doctor about whether that “someone” is you.

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