The Silent Process Behind Most Heart Attacks
The heart, the arteries, and how atherosclerosis actually develops
Cardiovascular disease remains the leading cause of death worldwide — an estimated 19.8 million deaths in 2022 alone, roughly a third of all deaths globally, with the large majority attributable to heart attack and stroke[1]. Understanding the basic mechanics of how the system fails is the foundation for everything else in this guide.
The Heart as a Pump, the Arteries as Pipes
The heart pumps roughly 5 litres of blood per minute at rest, delivering oxygen and nutrients through a branching network of arteries. Blood pressure is the force that blood exerts against artery walls as it's pumped — too little, and tissues are under-perfused; chronically too much, and the artery walls themselves are damaged over time, which is the mechanistic starting point for most cardiovascular disease.
Atherosclerosis: The Slow Process Behind Most Heart Disease
Atherosclerosis is the process by which cholesterol-carrying particles work their way into artery walls, triggering an inflammatory response that builds up as plaque over years to decades. This narrows the artery and stiffens it, and it's the underlying process behind most heart attacks and many strokes — not a sudden event, but the endpoint of a slow process that typically began decades earlier and produced no symptoms along the way.
The particles that drive this process are counted by a blood test called ApoB, which measures the number of cholesterol-carrying particles rather than their total mass — and predicts cardiovascular risk more precisely than standard LDL cholesterol.
The inflammation involved in plaque formation is part of why hs-CRP (high-sensitivity C-reactive protein), a blood marker of whole-body inflammation, adds predictive information beyond cholesterol numbers alone.
Blood pressure accelerates this process mechanically, by increasing the physical stress on artery walls where plaque is forming.
Why "No Symptoms" Is the Central Problem
Every major driver of cardiovascular risk covered in this guide — blood pressure, cholesterol particle number, blood sugar, visceral fat — is asymptomatic until the disease process is well advanced. This is precisely why the guide is structured around numbers you have to actively seek out, rather than symptoms you'd notice on your own. By the time symptoms appear, the disease process has typically been running silently for years.
Section takeaway
Cardiovascular disease is overwhelmingly a slow, silent process — plaque accumulating in artery walls over decades — rather than a sudden event with no warning. The "warning" exists; it's just in bloodwork and blood pressure readings, not in how you feel.