How to Prevent Heart Disease: The Nine Factors That Account for Most of the Risk

Published on 24 September, 2026

Heart disease is the leading cause of death worldwide, and it is also among the most preventable. That is not a slogan—it comes from one of the largest studies ever run on the subject.

The useful version of heart disease prevention is not a long list of virtuous habits. It is a short list of factors that account for nearly all of the risk, and a small set of numbers worth knowing about yourself.

Nine Factors, Ninety Percent of the Risk

The INTERHEART study, published in The Lancet in 2004, enrolled 15,152 people who had suffered a first heart attack and 14,820 matched controls across 52 countries on every inhabited continent. It set out to establish what actually drives risk, and whether the answer differs by region.

Nine modifiable factors emerged. Collectively they accounted for 90 percent of the population attributable risk in men and 94 percent in women—and the pattern held across men and women, young and old, and every region studied.

Risk factor	Population attributable risk	Note
Abnormal blood lipids	49.2%	Measured as the apolipoprotein B to apolipoprotein A1 ratio
Smoking	35.7%	Current and former versus never
Psychosocial factors	32.5%	Stress, depression, life control. Higher than most people expect
Abdominal obesity	20.1%	Waist-to-hip ratio, not body mass index
High blood pressure	17.9%
Too little fruit and vegetables	13.7%	For lack of daily consumption
Too little physical activity	12.2%
Diabetes	9.9%
Alcohol	6.7%	See the note below; the picture has moved since 2004

Population attributable risk describes how much of the disease in a population would disappear if the factor were removed. The figures overlap and do not sum to 100, which is why the combined total is not simply the addition of the column.

The headline is worth sitting with. Almost all of the risk of a first heart attack sits in things that can be changed.

The Numbers Worth Knowing

Most heart disease prevention comes down to five measurements, none of which you can feel.

Measure	Why it matters	When to check
Blood pressure	Raised pressure damages arteries silently for years	At least every two years; annually over 40
Cholesterol panel	Low-density lipoprotein (LDL) cholesterol drives plaque formation	Every four to six years from age 20; more often with risk factors
Blood glucose or glycated hemoglobin	Diabetes roughly doubles risk	From age 35, or earlier with a family history or excess weight
Waist measurement	Abdominal fat predicts risk better than weight alone	Whenever you weigh yourself
Smoking status	The single most reversible factor on the list	Continuously, and honestly

If you know none of your numbers, that is where prevention starts—not with a supplement.

Smoking

Nothing else on the list moves risk as far or as fast. Risk begins falling within weeks of stopping and continues falling for years afterward.

If you smoke and change only one thing, change this one. Stopping is difficult, relapse is normal rather than a failure, and the combination of medication and behavioral support works substantially better than willpower alone. Ask your doctor what is available rather than attempting it unassisted for a fifth time.

Blood Pressure

Raised blood pressure produces no symptoms until it has been doing damage for years, which is why it is so often described as silent. Most people who have it feel entirely well.

Reduce sodium, which for most people means reducing processed and restaurant food rather than the salt cellar
Increase potassium from vegetables, fruit and legumes, which works in the opposite direction
Keep alcohol modest, since it raises blood pressure reliably
Move regularly, which lowers pressure independently of weight
Take prescribed medication as directed if you have been given it. Blood pressure medication is among the best-evidenced treatments in medicine

Cholesterol

Abnormal lipids carried the largest attributable risk in INTERHEART, and the measure used was the ratio of apolipoprotein B to apolipoprotein A1 rather than total cholesterol—a reminder that the particles matter more than the single number most people are given.

The dietary detail is covered properly in the companion articles on foods that harm the heart and on low-density lipoprotein cholesterol. In summary: replace saturated fat with unsaturated, eat more soluble fiber, and treat a raised reading as a conversation with your doctor rather than something to manage alone.

Blood Sugar

Diabetes roughly doubles cardiovascular risk, and the damage begins during the prediabetic years before any diagnosis is made. Prediabetes is common, largely symptomless, and substantially reversible—which makes it one of the better returns available in prevention.

Waist Rather Than Weight

INTERHEART used waist-to-hip ratio rather than body mass index, and that choice was deliberate. Fat stored around the abdomen and around the organs behaves differently from fat stored on the hips and thighs, and it predicts cardiovascular risk considerably better.

A tape measure around the waist tells you more about your heart than the bathroom scale does. It is also more responsive—waist often falls before weight does when habits change.

Movement

A 2025 dose-response meta-analysis in The Lancet Public Health pooled prospective studies of device-measured daily steps. Compared with 2,000 steps a day, 7,000 steps was associated with 47 percent lower all-cause mortality, 25 percent lower cardiovascular disease incidence and 47 percent lower cardiovascular mortality.

Two things stand out. The benefit curve bends sharply between roughly 5,000 and 7,000 steps, meaning the largest gains come from moving from very little to moderately active rather than from moderately active to athletic. And 7,000 is a good deal less than the 10,000 that everybody quotes.

The types of exercise that matter most for the heart, and how to combine them, are covered in the companion article on exercise for heart health.

Stress and Mood

This is the finding people find hardest to believe. Psychosocial factors—stress at work and at home, financial strain, depression, low sense of control over life—carried a population attributable risk of 32.5 percent in INTERHEART, placing them above high blood pressure and abdominal obesity.

Some of that works through behavior: people under sustained strain sleep worse, move less, eat differently and smoke more. Some of it appears to be direct, through blood pressure, inflammation and clotting.

Either way, treating stress as a cardiovascular risk factor rather than a mood problem is closer to what the evidence supports. Depression in particular is both common and treatable, and is worth raising with a doctor for reasons that go well beyond the heart.

Alcohol

INTERHEART found regular alcohol consumption associated with slightly lower risk, with a small attributable figure. That finding is now twenty years old, and the evidence has moved.

Later analyses using genetic methods, which are less vulnerable to the confounding that affected earlier observational work, have largely undermined the idea of a protective effect. Current public health guidance does not recommend that anyone start drinking for cardiovascular benefit, and less is better across most outcomes.

If you drink, keeping it modest remains sensible. Taking it up for your heart does not.

What You Cannot Change

Age, sex, ethnicity and family history all affect risk and none of them are modifiable. They are still worth knowing, because they change how aggressively the modifiable factors should be managed.

A first-degree relative with early heart disease—a father or brother before 55, a mother or sister before 65—is a genuine reason to start screening earlier and to treat borderline numbers more seriously.

When to Get Urgent Help

Prevention has limits, and recognizing an event matters as much as avoiding one.

Call emergency services immediately for chest pain or pressure lasting more than a few minutes, or pain spreading to the arm, jaw, neck or back, particularly with breathlessness, sweating, nausea or light-headedness.

One point deserves emphasis. Women are more likely than men to present without classic crushing chest pain, instead experiencing breathlessness, unusual fatigue, nausea, or discomfort in the jaw, neck or back. Those presentations are more often dismissed, by patients and sometimes by clinicians. If something feels seriously wrong, say so clearly and ask directly whether your heart has been checked.

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FAQs

Q: What is the single most important thing I can do?

A: Stop smoking, if you smoke. Nothing else on the list moves risk as far or as fast. If you do not smoke, then knowing and managing your blood pressure and cholesterol is where the largest return sits.

Q: How much of heart disease is actually preventable?

A: In the INTERHEART study across 52 countries, nine modifiable factors accounted for 90 percent of the population attributable risk of a first heart attack in men and 94 percent in women.

Q: How many steps a day do I need?

A: Around 7,000, on current evidence. Compared with 2,000 steps, 7,000 was associated with 47 percent lower all-cause mortality and 25 percent lower cardiovascular disease incidence. The curve bends between 5,000 and 7,000, so the biggest gains come from moving from very little to moderately active.

Q: Is stress really a heart disease risk factor?

A: The evidence says yes, and more strongly than most people expect. Psychosocial factors carried a higher population attributable risk in INTERHEART than high blood pressure did. Some of the effect runs through behavior, and some appears to be direct.

Q: Should I drink red wine for my heart?

A: No. The older observational evidence suggesting a protective effect has largely not held up under methods less vulnerable to confounding. Current guidance does not recommend starting to drink for cardiovascular benefit.

Q: When should I get my cholesterol checked?

A: Generally every four to six years from age 20, and more often if you have other risk factors or a family history of early heart disease. Ask your doctor what interval is right for you.

Q: Is waist measurement better than weight?

A: For cardiovascular risk, yes. INTERHEART used waist-to-hip ratio rather than body mass index because abdominal fat predicts risk better. A tape measure tells you more about your heart than the scale.

Q: Can heart disease be reversed?

A: Progression can be slowed substantially and some plaque features can improve with intensive treatment of risk factors. Whether that counts as reversal depends on definitions, and it is a conversation for a cardiologist rather than a blog.

Q: What if heart disease runs in my family?

A: A first-degree relative affected early—a father or brother before 55, a mother or sister before 65—is a reason to screen sooner and to treat borderline numbers more seriously. Family history raises the stakes on the factors you can change rather than removing them.

Q: Do heart attack symptoms differ between men and women?

A: Symptoms often do differ. Women more often present without classic crushing chest pain, instead with breathlessness, unusual fatigue, nausea or discomfort in the jaw, neck or back. These presentations are more likely to be dismissed, so be direct about your concern and ask whether your heart has been checked.

Sources

Yusuf S, Hawken S, Ounpuu S, et al. Effect of potentially modifiable risk factors associated with myocardial infarction in 52 countries (the INTERHEART study): case-control study. The Lancet, 2004. PMID 15364185
Ding D, Nguyen B, Oliveira Gomes C, et al. Daily steps and health outcomes in adults: a systematic review and dose-response meta-analysis. The Lancet Public Health, 2025. PMID 40713949
Stens NA, Bakker EA, Mananas MA, et al. Relationship of daily step counts to all-cause mortality and cardiovascular events. Journal of the American College of Cardiology, 2023. PMID 37676198
Mendoza K, Smith-Warner SA, Rossato SL, et al. Ultra-processed foods and cardiovascular disease: analysis of three large US prospective cohorts and a systematic review and meta-analysis of prospective cohort studies. The Lancet Regional Health Americas, 2024. PMID 39286398

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