Most heart attacks are preventable. Roughly 80% of cardiovascular risk is shaped by what you eat, whether you smoke, how you move, your blood pressure, and how you handle stress and sleep. The five steps below are where the leverage lives.
~80%
Fewer cardiovascular events when modifiable risk factors are addressed together (INTERHEART; long-term cohort data).
44%
Lower heart attack risk within five years of stopping. Cutting down doesn't help — only complete cessation does.
~30%
Reduction in major cardiovascular events shown in PREDIMED for primary prevention in high-risk adults.
The reality check: testing isn't prevention
Whenever a high-profile sudden death makes headlines, my clinic fills with patients asking for "the test that prevents heart attacks." There isn't one. No scan or blood test eliminates risk if the underlying drivers — smoking, inactivity, untreated blood pressure, untreated lipids — go unaddressed.
Tests refine risk and guide treatment intensity. A coronary calcium score can shift a borderline patient toward or away from a statin. Lp(a) measured once in adulthood identifies an inherited risk that won't show up on standard lipids. An echocardiogram or stress test investigates symptoms or specific findings.
Tests don't replace the work. A normal scan in a current smoker with untreated hypertension is reassurance about today, not a forecast for the next decade.
For stable coronary disease, large randomised trials (COURAGE, ISCHEMIA) have shown that guideline-directed medical therapy plus lifestyle change matches stenting and bypass for preventing future heart attacks. Procedures relieve symptoms and are essential for acute events; they don't cure atherosclerosis.
Know your real risk
Heart attacks happen when atherosclerotic plaque ruptures or erodes and triggers a clot that blocks blood flow. The plaque builds over decades, driven by a mix of factors you can't change and factors you can.
Factors you can't change
Family history of premature heart disease (men <55, women <65 in a first-degree relative). Age — risk rises after 45 in men, 55 in women. Inherited conditions such as familial hypercholesterolaemia or elevated lipoprotein(a). These set your starting point — they don't dictate your destination.
Factors you control
Blood pressure (silent until it isn't). Smoking, including occasional or social. Diabetes and pre-diabetes. Physical inactivity. Diet pattern. LDL cholesterol and apoB. Chronic stress and poor sleep. Genetics load the gun; these factors pull the trigger.
The headline: even with adverse genetics, controlling the modifiable factors substantially lowers your absolute risk. The five steps that follow are where you get the most leverage.
The 5-step plan
Each step below is supported by large randomised trials or long-term cohort data. The relative risk reductions are real, but the compound effect — when you do all five — is greater than the sum of the parts.
1
If you smoke, stop. This one isn't negotiable.
Smoking damages the artery wall within minutes of each cigarette. The good news: the body recovers fast.
Heart attack risk falls by roughly 44% within five years of quitting, and continues to drop for at least a decade. Cutting down doesn't help — large cohort studies show no meaningful cardiovascular benefit until you stop completely. Vaping is not a proven cessation tool and carries its own cardiovascular signals.
2
Move 30 minutes most days
You don't need a gym. You need consistency.
The dose-response curve for physical activity and cardiovascular events is steep at the low end — going from sedentary to 30 minutes of daily moderate activity gives you most of the benefit. Walking briskly counts. So does gardening, swimming, dancing, or playing with grandchildren. What matters is heart rate and frequency, not the venue.
If you've been sedentary, build up gradually — start with 10-minute walks twice daily and add a few minutes each week. Resistance training twice weekly adds to the benefit, particularly for blood pressure and glucose control.
3
Fix your diet by elimination, not perfection
The best diet is the one you'll actually keep doing.
Rather than chasing a perfect dietary protocol, start by removing what's clearly harmful. Track everything you eat for three days, then cross out the obvious junk and don't buy those items next shop. Allow yourself two flexible days a week — sustainability beats stricture.
Eat more of: vegetables and fruit, olive oil, fatty fish (twice weekly), whole grains, nuts (a handful most days), legumes. Eat less of: ultra-processed foods, sugar-sweetened drinks, refined carbohydrates, processed meats, deep-fried foods. A simple rule: if it has more than five ingredients on the packet, think twice.
On alcohol, the picture has shifted. Earlier observational studies suggesting modest amounts protected the heart have been undermined by better-designed analyses controlling for socioeconomic factors and the "sick quitter" effect. The current evidence: less is better, and risk rises with intake. If you drink, keep it modest and have alcohol-free days.
4
Manage stress and protect sleep
Chronic stress isn't just unpleasant — it's atherogenic.
Sustained psychological stress raises blood pressure, drives systemic inflammation, increases platelet reactivity, and degrades sleep. I've seen young, fit patients have heart attacks where chronic stress was the dominant modifiable factor. The mechanism isn't mystical — cortisol and catecholamines, day after day, change your physiology.
Sleep matters in its own right. Consistently fewer than six hours nightly is associated with higher cardiovascular risk independent of other factors. If you snore loudly, wake unrefreshed, or your partner observes pauses in your breathing, ask your GP about screening for obstructive sleep apnoea.
5
Know your numbers and treat them
You can't manage what you don't measure — and measuring without acting changes nothing.
Six numbers do most of the work in cardiovascular prevention: blood pressure, LDL cholesterol (and apoB if available), HbA1c, waist circumference, BMI, and lipoprotein(a) measured once. The reference table below gives the targets and how often to check.
Critically, knowing a number isn't the goal — acting on it is. High blood pressure and high LDL produce no symptoms until the artery is already damaged. If you're at moderate or high risk, lifestyle alone often isn't enough — guideline-directed medication (statins, antihypertensives) substantially reduces events.
One additional number is worth knowing if your calculated risk sits in the borderline-to-intermediate range: your coronary artery calcium (CAC) score. Unlike the markers above, CAC isn't something to check routinely — it's a targeted test that directly visualises whether atherosclerosis is already present in your heart's arteries. A score of zero meaningfully de-escalates risk; a high score escalates it. The result often changes whether starting a statin is the right call. Read the full guide to CAC scoring.
Know your numbers
These targets reflect Australian and international guideline consensus for adults at moderate-to-high cardiovascular risk. Your individual targets may be tighter (or, less commonly, looser) depending on your overall risk profile — discuss with your doctor.
| Measurement | Target | How often |
|---|---|---|
| Blood pressure | <130/80 mmHgtighter targets if higher risk | Yearly if normal; more if elevated |
| LDL cholesterol | <1.8 mmol/L<70 mg/dL | Every 1–5 years; sooner if treated |
| ApoB | <0.8 g/L<80 mg/dL | As an alternative to LDL, especially if triglycerides are high |
| Lipoprotein(a) | <75 nmol/L (≈30 mg/dL)elevated >125 nmol/L | Once in adulthood |
| HbA1c | <5.7% (<39 mmol/mol)5.7–6.4% = pre-diabetes | Every 1–3 years; yearly if at risk |
| Waist circumference | Men <94 cm; Women <80 cmMen <37 in; Women <31.5 in | Self-check monthly |
| BMI | 18.5–24.9 kg/m²overweight 25–29.9; obese ≥30 | Self-check quarterly |
Tools to track and lower your risk
Use these calculators to put numbers on what you've read above. Each is built around the relevant guideline standard.
AHA PREVENT
Your validated 10-year and 30-year cardiovascular risk estimate, replacing the older Pooled Cohort Equations.
Calculate your risk
CAC interpretationMESA CAC Risk
If you've had a coronary calcium score, this estimates your 10-year risk incorporating that result alongside your other factors.
Interpret your CAC
CAC percentileCAC Score Percentile
See where your calcium score sits relative to others your age and sex — useful context for understanding what the absolute number means.
Find your percentile
Lipid targetsLipid Targets Reference
What your LDL, non-HDL, and apoB targets should be based on your overall cardiovascular risk category.
Find your target
FH screeningFamilial Hypercholesterolaemia
DLCN-based screen for inherited high cholesterol — if family history of early heart disease, do this one.
Check your score
All toolsCalculator Hub
Browse all cardiovascular risk calculators and reference tools — ApoB, glucose, BMI, BP tracker, and more.
See all calculators
When tests genuinely help
Used well, cardiovascular tests refine risk and guide treatment. Used poorly, they generate anxiety, false reassurance, or unnecessary downstream investigation. Here's the brief on the most commonly requested tests.
Best for borderline risk
A non-contrast CT that quantifies calcified plaque. Most useful when your calculated 10-year risk is in the borderline-to-intermediate range and the result would change whether you start a statin. Read the full guide.
Once in adulthood
An inherited risk factor that won't show up on standard lipid panels. Measure once — it doesn't meaningfully change with diet or statins. Elevated Lp(a) shifts treatment intensity for everything else. Patient guide.
Symptom or finding-driven
An ultrasound of the heart's structure and function. Not a screening tool for healthy adults — used when symptoms (breathlessness, chest pain), an abnormal ECG, a murmur, or another finding raises a specific question.
Investigates symptoms
Exercise or stress imaging looks for inducible ischaemia. Indicated when symptoms suggest possible coronary disease — not as routine screening for asymptomatic adults, where it produces high false-positive rates.
The pattern: tests work best when there's a specific question to answer. "Am I at risk?" is too vague — "Should I start a statin given my borderline LDL and family history?" is the kind of question a CAC score can usefully resolve.
- Most heart attacks are preventable. Roughly 80% of risk is shaped by modifiable factors. Genetics set the floor, not the ceiling.
- Tests don't replace the work. No scan or blood test can offset smoking, untreated blood pressure, or untreated lipids. Tests refine risk; they don't reduce it.
- The five steps compound. Quitting smoking, moving 30 minutes daily, eating a Mediterranean-style diet, managing stress and sleep, and treating your numbers — done together, these give roughly 80% risk reduction.
- Know your numbers and act on them. Blood pressure, LDL, HbA1c, waist, BMI, and Lp(a) once. Targets matter only if you treat what you measure.
- Start small, stay consistent. Pick one change, master it for a month, then add another. Perfection isn't the goal — durable habits are.
Common questions
Is it ever too late to start?
No. Cardiovascular risk reduction from quitting smoking, lowering LDL, treating blood pressure, and increasing physical activity has been demonstrated in adults well into their 70s and 80s. The relative benefit is similar across ages; the absolute benefit can actually be greater in older adults because their baseline risk is higher.
Should I take aspirin to prevent a heart attack?
Routine aspirin for primary prevention is no longer recommended for most adults. Recent guidelines (ACC/AHA, USPSTF) restrict primary-prevention aspirin to selected high-risk patients under 70, weighing cardiovascular benefit against bleeding risk. If you've already had a cardiovascular event, aspirin is part of secondary prevention. Discuss with your doctor — don't start it on your own.
Are statins safe long-term?
Statins are among the most studied medications in clinical history, with safety data from millions of patient-years. The major modifiable risks are muscle aches (often dose-related and manageable) and a small increase in new-onset diabetes in those already at risk. The benefit — substantial reduction in heart attack and stroke — outweighs these risks for patients who meet treatment criteria. Liver injury is rare and overstated. Cognitive effects have not been confirmed in randomised trials.
What about supplements — fish oil, CoQ10, garlic, vitamin D?
The evidence is largely disappointing. Fish oil supplements have not consistently reduced cardiovascular events in well-designed trials at standard doses; high-dose icosapent ethyl (a prescription product) has shown benefit in selected high-triglyceride patients but is different from over-the-counter omega-3. CoQ10, garlic, and vitamin D supplements have not demonstrated cardiovascular event reduction in primary prevention trials. Eating fish twice weekly is supported; taking pills as a substitute is not.
I exercise regularly and eat well. Do I still need cholesterol checks?
Yes. Lifestyle improves cholesterol modestly for most people, but inherited factors (familial hypercholesterolaemia, elevated Lp(a)) can produce high cardiovascular risk regardless of how well you live. A baseline lipid panel and Lp(a) measured once in adulthood will tell you whether genetics are working with you or against you.
How do I know when to see a cardiologist?
See your GP first for routine cardiovascular risk assessment. A cardiologist referral is appropriate if you have: chest pain or unexplained breathlessness, a strong family history of early heart disease, very high LDL or elevated Lp(a) that's hard to manage, an abnormal ECG or echocardiogram, treatment-resistant blood pressure, or a calcium score that's outside the normal range for your age. If you've calculated your 10-year risk and it sits in the high or borderline-high range, a single specialist consultation can help shape the next decade.
What about coffee, eggs, and red meat — the things I see contradictory advice about?
For most healthy adults: moderate coffee (up to three to four cups daily) is associated with neutral or modestly favourable cardiovascular outcomes. Eggs in moderation (around one daily) are not the dietary villain they were portrayed as in the 1980s — for most people they don't meaningfully raise cardiovascular risk. Red meat, especially processed red meat (bacon, sausages, deli meats), is consistently associated with higher cardiovascular and overall mortality — limit to occasional rather than regular.
Can stress alone cause a heart attack?
Acute extreme stress can trigger an event in someone with underlying disease (Takotsubo cardiomyopathy is the classic stress-induced syndrome). Chronic stress contributes to atherosclerosis through sustained blood pressure elevation, inflammation, and behavioural pathways (poor sleep, comfort eating, alcohol, smoking). It rarely causes heart attacks in genuinely healthy arteries — but it accelerates damage in arteries that already have plaque.
References and further reading
- Yusuf S, et al. Effect of potentially modifiable risk factors associated with myocardial infarction in 52 countries (the INTERHEART study). Lancet. 2004;364:937–952. PubMed
- Estruch R, et al. Primary prevention of cardiovascular disease with a Mediterranean diet supplemented with extra-virgin olive oil or nuts (PREDIMED). N Engl J Med. 2018;378:e34. PubMed
- U.S. Department of Health and Human Services. The Health Consequences of Smoking — 50 Years of Progress. Surgeon General's Report, 2014. NCBI Bookshelf
- Stamler J, et al. Low risk-factor profile and long-term cardiovascular and noncardiovascular mortality and life expectancy. JAMA. 1999;282:2012–2018. PubMed
- Boden WE, et al. Optimal medical therapy with or without PCI for stable coronary disease (COURAGE). N Engl J Med. 2007;356:1503–1516. PubMed
- Maron DJ, et al. Initial invasive or conservative strategy for stable coronary disease (ISCHEMIA). N Engl J Med. 2020;382:1395–1407. PubMed
- Khan SS, et al. Development and validation of the AHA PREVENT equations. Circulation. 2024;149:430–449. PubMed
- Grundy SM, et al. 2018 AHA/ACC guideline on the management of blood cholesterol. Circulation. 2019;139:e1082–e1143. PubMed
Get a personalised risk assessment
If you'd like to translate this guide into a tailored prevention plan — including lipid testing, Lp(a), risk calculation, and where appropriate, calcium scoring — book a consultation. Referrals required for Medicare rebate.
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