There is something not altogether amusing in the spectacle of modern medicine denouncing theology while constructing dogmas of its own. A hypothesis emerges, finds some empirical support, acquires institutional prestige, gathers bureaucratic patrons, and then, by a process half intellectual and half political, hardens into a creed. Dissent ceases to be treated as argument and is managed instead as pathology. Those who question are no longer mistaken but dangerous. It is difficult not to see in the cholesterol hypothesis something of this history.

Dr Malcolm Kendrick has spent years poking at that orthodoxy, and what gives his work unusual force is not that he offers some lurid anti-medical fantasy, but that he asks embarrassingly simple questions. Why, if cholesterol is the initiating villain, do plaques often resemble the sediment of repeated injury and repair? Why do so many acknowledged “risk factors” for heart disease—smoking, diabetes, chronic stress, hypertension—appear less as agents of cholesterol deposition than as insults to the blood vessel wall? Why does the reigning theory often feel like a collection of correlations elevated into metaphysics? These are not eccentric questions. They are, rather, questions one might have expected a self-confident scientific culture to ask long ago.

Kendrick’s thrombogenic hypothesis, whatever one finally makes of it in its strongest form, has at least the virtue of trying to unify what conventional cardiology often leaves in compartments. The standard account has always had a strangely improvised quality. LDL cholesterol, we are told, somehow infiltrates artery walls, generates plaques, and eventually causes occlusive events. Yet the catastrophic event itself—a heart attack or stroke—is almost always clotting. The emergency physician does not rush to dissolve cholesterol. He rushes to dissolve thrombus. Kendrick’s question is therefore almost embarrassingly direct: if clotting is central at the end, why is it inconceivable that it may matter at the beginning?

His answer—that atherosclerosis is fundamentally the history of repeated endothelial injury, clot formation, and imperfect repair—has a certain explanatory elegance. One should be suspicious of elegance in science, because reality often refuses symmetry, but one should not dismiss it either. There is something intellectually satisfying in a model that makes smoking, diabetes, inflammation, hypertension and mechanical stress variations of one story instead of a miscellaneous bundle of “risk factors.”

And the endothelium, once one attends to it, does look strangely neglected in popular discussion. Modern medicine talks endlessly of cholesterol counts and almost never of the integrity of the vessel lining, as if the pipes mattered less than the grease imagined to be moving through them. Yet the vascular endothelium is no passive wallpaper. It is metabolically alive, anticoagulant when healthy, regulating nitric oxide, inflammation, permeability, vasodilation. Damage it, and one can plausibly imagine much beginning to go wrong.

This is where Kendrick is strongest. Not necessarily in proving every rival explanation false, but in forcing attention toward mechanisms long treated as secondary. Even orthodox literature has increasingly shifted in this direction. Endothelial dysfunction is no fringe concept. Nor is inflammation. Nor the role of thrombosis in plaque progression and rupture. One might say, indeed, that part of Kendrick’s argument has been quietly absorbed by the very orthodoxy he criticises, though without admission.

And this matters, because medical error often consists not in outright falsehood but in treating one partial truth as the whole truth. Cholesterol may matter. It does not follow that cholesterol is the sovereign explanation.

There is a wider historical irony here. Much of twentieth-century nutrition policy was built on a moral drama in which fat was sinful, cholesterol demonic, restraint redemptive. It now seems obvious that much of this rested on shakier ground than advertised. The old low-fat consensus, with its industrial carbohydrates and sugar-laden substitutions, has aged poorly. That this should have happened is perhaps unsurprising. Technocratic systems, once organised around a metric, become incapable of seeing what the metric misses.

The French paradox, which Kendrick rightly invokes, always had this destabilising effect. A civilisation marinated in butter, cheese and pâté was somehow not collapsing in proportion to its saturated fat consumption. Such anomalies were often explained away, but anomalies have a bad habit of surviving explanation.

There is perhaps a deeper philosophical point. Biology rarely obeys monocausal narratives. Diseases of ageing and civilisation tend to emerge from convergences: metabolic disturbance, mechanical wear, inflammation, environmental insult, hereditary vulnerability. The urge to find one villain—fat, LDL, salt—is often less scientific than administrative. It allows guidelines, campaigns, industries. One sees the same tendency in hypertension debates. Numbers drift lower; thresholds expand; half the population becomes pre-pathological. Medicine begins to resemble border control. There is reason to be wary.

Still, one should resist overcorrection. Here I part company slightly with some enthusiasts for Kendrick. It does not follow from weaknesses in the cholesterol dogma that LDL is irrelevant or statins mere fraud. That conclusion often exceeds the evidence. There remains serious evidence that apoB-containing particles play some causal role in atherogenesis. Mendelian randomisation, familial hypercholesterolaemia data, and intervention studies cannot simply be waved away as pharmaceutical theatre.

But even here Kendrick performs a service. He reminds us that even if statins help, their benefit may not be reducible to LDL lowering. Anti-inflammatory and antithrombotic effects may matter more than the catechism admits. If so, the creed has again mistaken a marker for a mechanism.

There is a cautionary parallel with empire, oddly enough. Great systems often decay by mistaking proxies for realities. The Western Empire of the fifth century counted tax assessments while provinces hollowed out. Modern bureaucracies worship metrics while losing sight of the thing measured. Medicine is hardly exempt.

Kendrick’s attention to the glycocalyx has, to me, this same provocative quality. It may be that some of the more enthusiastic supplement culture around glycocalyx repair outruns evidence; one must say so plainly. Claims about seed oils, blood-flow restriction, or some nutraceutical panacea can drift from plausible into sectarian. Yet behind the exaggeration is a valid shift of emphasis: perhaps vascular resilience matters more than we have allowed.

His interest in nitric oxide, for instance, intersects with mainstream physiology in ways not easily dismissed. Exercise, sunlight, endothelial shear stress, metabolic health—these are not eccentric obsessions. They are among the few interventions repeatedly associated with broad protective effects. That should give pause.

The COVID episode made some of this harder to ignore. The prominence of endothelial injury and clotting in severe disease was, in a sense, a public tutorial in thrombogenic thinking. One need not follow every extension Kendrick makes into vaccine scepticism to recognise that the pandemic made the vascular dimension of disease unusually visible.

There is also something morally healthy in Kendrick’s insistence that ordinary people are not passive victims awaiting rescue through prescription. The modern patient is often reduced to biometrics and compliance. Protecting vascular health through smoking cessation, glycaemic control, exercise, stress reduction, decent sleep, and perhaps suspicion of ultra-processed food is almost offensively old-fashioned. Which may be why it retains truth.

Conservatives, though I use the word cautiously, ought to appreciate this instinct. One of the pathologies of modernity is the belief that complex civilisational damage can be repaired through administrative tweaks. Lower the number, issue the pill, manage the risk score. Kendrick’s revolt is in part against that managerial imagination.

And yet one must be honest. His thesis does not abolish mystery. Heart disease remains protean. There are people with immaculate lifestyles who die young, and libertines who outlive prudence. Biology keeps some of her secrets.

Nor should the thrombogenic hypothesis be turned into a rival orthodoxy, complete with its own heresy trials. It is strongest as correction, perhaps less certain as total replacement. Still, the correction may be profound. For decades, the public has been taught to imagine heart disease as a plumbing problem caused by dietary vice. It may be closer to chronic injury, failed repair, and disordered clotting in living tissue. That is not a trivial revision. It changes how one thinks about prevention itself.

It also reintroduces a forgotten category: fragility. Modern medicine often thinks in enemies to attack. Kendrick thinks more in structures to preserve. There is something almost classical in that. Health as integrity rather than perpetual intervention.

And perhaps that is why his work resonates beyond medicine. It speaks, in a way, to wider exhaustion with systems that always promise mastery and often deliver dependence. One should not romanticise dissidents merely because they dissent. Many are cranks. But sometimes a dissident reminds an establishment of what it once knew. Kendrick may be doing something like that.

I suspect the final truth about heart disease will be less dramatic than either camp prefers. Cholesterol will matter somewhat, thrombosis rather more than admitted, endothelial damage centrally, metabolism profoundly. Reality will refuse to join a faction. But if Kendrick helps pull cardiology away from number worship and back toward living physiology, he will have done something substantial.

And there is a larger warning in all this. When an orthodoxy survives by ridiculing anomalies rather than absorbing them, it has entered decline. That is true in medicine no less than politics. The irony is almost too neat. A theory built around blockage may itself have become intellectually obstructive.

Perhaps the clot was never only in the artery. Perhaps it was also in the thought.

Reading List

• Malcolm Kendrick, The Clot Thickens: The Enduring Mystery of Heart Disease (2021).
• Malcolm Kendrick, The Great Cholesterol Con (2007).
• Malcolm Kendrick, Doctoring Data (2014).
• Malcolm Kendrick, A Statin Nation (2018).
• Paul Rosch, Malcolm Kendrick and Uffe Ravnskov (eds.), Fat and Cholesterol Don’t Cause Heart Attacks and Statins Are Not the Solution.
• Uffe Ravnskov, The Cholesterol Myths (2000).
• Peter Libby, Inflammation in Atherosclerosis, Nature 2002.
• Russell Ross, “Atherosclerosis—An Inflammatory Disease,” New England Journal of Medicine 1999.
• John Vane and Salvador Moncada, papers on prostacyclin and endothelial biology.
• Michel de Lorgeril and Patricia Salen, Preventing Heart Disease.
• Gary Taubes, Good Calories, Bad Calories.
• Thomas Cowan, Human Heart, Cosmic Heart (worth reading critically, not unreservedly).

For background and contrast, I would also still read the orthodox case:

• Ference et al., “Low-density lipoproteins cause atherosclerotic cardiovascular disease,” European Heart Journal (2017).
• Yusuf et al., INTERHEART Study, Lancet (2004).

A sceptical education is best served not by reading only one side, but by reading both sides until the dogmas begin to look provisional.