Soft Plaque, Not Blockage, May Be the Heart Threat Cardiologists Warn Patients to Watch

A recent Instagram video from a US cardiologist, Dr Jeremy London, is pushing a point that heart disease warnings often skip. Most public talk centres on cholesterol numbers and how blocked an artery is. London argues that the more useful question is what kind of plaque is sitting in the artery wall.

He sorts arterial plaque into two broad categories, soft and hard. Both belong to atherosclerosis, the buildup of deposits inside arteries, but he describes them as dangerous in different ways. Soft plaque is fatty, inflamed and unstable. In his account, it is the more dangerous of the two in the short term, because it can rupture suddenly and set off a heart attack with little or no warning.

Hard plaque, also called calcified plaque, is older. London describes it as the scarred-over residue of long-standing disease, more stable and less likely to rupture abruptly. A heavy calcium burden in the arteries still matters, though. It means atherosclerosis has been present for years, even if the plaque itself looks stable. His distinction comes down to timing: soft plaque points to near-term cardiac events, while hard plaque signals risk over a lifetime.

That framing challenges a common assumption that heart attacks happen only when arteries are severely blocked. Because soft plaque is unstable, it can rupture even when the blockage is not extreme. This, the article notes, helps explain why some people have heart attacks despite mild symptoms or few warning signs. Hard plaque, by contrast, guides long-term prevention strategies rather than emergency intervention.

On detection, London says a CT coronary angiogram can identify both soft and hard plaque. He stresses that it is a screening tool, not a definitive diagnosis, and should be used only under a physician's guidance. For the right patient, he says, it can reveal hidden risk that standard tests may miss.

The article draws on Healthline for what can be done. Plaque buildup can often be stabilised and, in some cases, partially reversed through medication and lifestyle changes. Managing cholesterol, blood pressure, smoking, stress and physical activity plays a central role in slowing atherosclerosis. Healthline notes that statins can stabilise plaque within weeks and may lead to regression over time when paired with lifestyle changes.

Diet features prominently. Patterns such as the DASH eating plan, built around fruits, vegetables, whole grains and healthy fats, have been shown to lower LDL cholesterol and slow plaque progression. A 2021 study cited by Healthline found that combining dietary changes with physical activity slowed artery damage compared with no intervention. Research highlighted there also suggests pro-inflammatory foods may worsen plaque formation, which points to overall diet quality rather than fat intake alone.

On exercise, health authorities recommend 150 to 300 minutes of moderate-intensity activity per week, plus muscle-strengthening work twice weekly. Maintaining a moderate weight, quitting smoking, limiting alcohol and reducing stress are also listed as contributors to healthier arteries.

London speaks from experience. He is a board-certified cardiothoracic and vascular surgeon with more than 25 years in practice, and he is also a heart attack survivor who had a 99 percent blockage in his right coronary artery. He uses his platform to turn complex heart science into practical advice: exercise regularly, avoid ultra-processed foods, and eliminate alcohol. Anyone wondering whether a scan makes sense for them is directed back to the same place, a conversation with their own physician.