More than half of 16,000 healthy-looking adults already had plaque building up inside their arteries, and even some people in their twenties were not spared.
Quick Take
- A new study scanned over 16,800 adults with no known heart disease and found silent atherosclerosis in 57.1% of them.
- About 1 in 13 adults ages 18 to 29 already had artery plaque, despite feeling perfectly healthy.
- Researchers used advanced imaging, not standard risk calculators, to catch disease that normal checkups often miss.
- Doctors say the findings push the case for earlier screening, even though guidelines on this remain unsettled.
A Massive Study Finds Plaque Hiding in Plain Sight
The study is called REACT. Researchers in Denmark and Spain examined 16,808 adults between ages 18 and 70, none of whom had been diagnosed with heart disease. Using imaging instead of guesswork, they found atherosclerosis, the artery-clogging plaque behind most heart attacks and strokes, in 57.1% of participants. The results ran in the New England Journal of Medicine and were presented at the European Society of Cardiology Congress in Munich.
What makes this study different is the tool. Instead of relying only on cholesterol numbers or family history, researchers physically looked inside the arteries. They used 3-dimensional vascular ultrasound on the neck and leg arteries, plus coronary computed tomographic angiography to check the heart’s own blood vessels and measure calcium buildup. That combination caught disease that standard risk scores simply cannot see.
Young Adults Are Not as Safe as They Think
The headline number that should worry every parent of a twenty-something: about 1 in 13 adults ages 18 to 29 already had detectable plaque in at least one artery. Broken down by sex, roughly 8.7% of young men and 6.7% of young women showed signs of disease. That is not a rounding error. That is a real, measurable share of a generation assuming they are too young to worry about their hearts.
The trend only grows worse with age, exactly as you would expect, but the climb is steep. One analysis of the data found prevalence near 5% before age 30, jumping to roughly 30% between ages 30 and 50, then 60% between 50 and 70, and a striking 90% past age 70. Plaque is not something that suddenly appears at retirement. It is a decades-long buildup that starts quietly while people feel completely fine.
Why Standard Checkups Keep Missing It
Most people under 40 never get an artery scan. Doctors typically rely on risk calculators built from cholesterol, blood pressure, smoking status, and age. Those tools work reasonably well at a population level, but they miss individual cases, especially in younger patients who do not yet carry obvious red flags. The European Society of Cardiology’s own press release stressed that this disease was “not captured by conventional risk assessment” in a meaningful share of cases.
This is not a brand-new argument among cardiologists. Imaging has long been shown to outperform risk equations at reclassifying people’s true danger level, especially those sitting in a gray zone of moderate risk. The catch has always been proving that finding plaque earlier actually leads to better outcomes, not just more worried patients and more expensive scans with uncertain payoff.
What This Means for Screening Decisions Going Forward
Current guidelines reflect that tension. The American College of Cardiology and American Heart Association recommend an initial cholesterol panel for adults over 20, while the U.S. Preventive Services Task Force waits until 35 for men and 45 for women unless extra risk factors exist. Coronary calcium scoring, meanwhile, is still not advised for routine screening in young adults because so many would need scanning to catch a small number of cases.
That debate over cost and benefit is legitimate, and taxpayer-funded healthcare systems have every reason to demand solid evidence before expanding expensive imaging to millions of young, symptom-free adults. But this study adds real weight to the case that waiting until middle age to think about heart health starts too late. Parents, young adults, and family doctors now have hard numbers showing the clock on artery disease starts ticking decades earlier than most people assume.
The practical takeaway is simple and does not require a government mandate or a new scanning program to act on. Diet, exercise, blood pressure control, and quitting tobacco all slow plaque buildup regardless of age, and this study gives young adults one more solid reason to take those habits seriously well before they turn 40.
Sources:
sciencedaily.com, cnic.es, english.elpais.com, topics.consensus.app, medicinenet.com, health.stonybrookmedicine.edu
