What a Gold Standard Really Is — and Why I Question My Own LDL Number
Important: This article is about how medical certainty gets built, not medical advice. The lipid hypothesis remains the mainstream position, supported by a large body of later evidence, and major guidelines recommend LDL-lowering for appropriate patients. Do not start, stop, or change any medication on the strength of an essay — that belongs with your physician.
There is a term in medicine: the gold standard. It means the most ideal and firmly established criterion against which the reliability and accuracy of a diagnosis, treatment, test, or piece of research is judged — the method accepted as the most accurate and trustworthy, the one every other method is compared against. In infectious disease, PCR is generally the gold standard for diagnosis, because it is highly accurate and sensitive. In tumour diagnosis, tissue biopsy is the final gold standard. In treatment, the therapy considered most effective for a given cancer is called the gold standard. A gold standard is supposed to have high reliability and reproducibility, a low error rate and high accuracy, and to serve as the benchmark by which other methods are judged.
In Summary
- A gold standard is the established benchmark for a diagnosis or treatment — high reliability, low error, the yardstick for everything else.
- One such gold standard is that hypercholesterolemia (hyperlipidemia) raises mortality from cardiovascular disease.
- My own checkups always flag suspected hyperlipidemia, yet every sub-item sits in the standard range and only LDL runs high — which made me curious about the standard itself.
- The lipid hypothesis, proposed by Ancel Keys, holds that saturated fat raises blood cholesterol, which forms plaque in the arteries and causes heart attack and stroke; the Seven Countries Study is its best-known support.
- Critics — including the cardiologist Stephen Sinatra — argue the case was built partly by selecting favourable statistics, and raise questions about industry influence. These are contested claims from the critics’ side, not settled fact.
- The point worth keeping: theories presented as firm and settled are sometimes founded more loosely than we assume — and I may be wrong too.
The Standard I Keep Failing
One of these gold standards is the proposition that hypercholesterolemia — hyperlipidemia — raises mortality from cardiovascular disease. I have a personal stake in it. Whenever I have a health checkup, I come out at the “suspected hyperlipidemia” stage. But when I look at the detail, every sub-item is within the standard range; only LDL, the low-density lipoprotein, reads high. Being told I have a condition on the strength of a single number I do not fully understand is what sent me reading.
What the Lipid Hypothesis Says
The lipid hypothesis, put forward by Ancel Keys, holds that saturated fat intake raises blood cholesterol levels, and that this forms plaque — atheroma — in the arteries and thereby causes cardiovascular disease such as myocardial infarction and stroke. Many studies have supported it; the best known is the Seven Countries Study, in which a correlation was found between saturated fat intake and heart disease. This hypothesis is the theory underlying the current standard of care: hyperlipidemia means a statin.
The Critics’ Case — and How to Hold It
I have been reading a book on what cholesterol numbers mean, written by a cardiologist, Stephen Sinatra, and it contains a great deal that surprised me. The most surprising was his account of how the gold standard “hyperlipidemia equals cardiovascular death” came to be established: that in order to argue the hypothesis that high cholesterol raises cardiac mortality, favourable statistical results were selected. Hyperlipidemia, on his telling, both raises and lowers cardiovascular death depending on the population studied — and the data from countries where it raised them was the data used. The book also raises the lobbying of the American grain industry and the commercial interests of pharmaceutical companies.
I want to be careful here, because these are the critics’ arguments and they are contested. Defenders of the lipid hypothesis point out that the case no longer rests on Keys’s early work at all, but on decades of subsequent trials and genetic evidence, and mainstream cardiology continues to hold that lowering LDL reduces events in appropriate patients. So I offer this not as a debunking but as a caution about certainty. What strikes me is the process: individuals ought to know that the way a theory said to be firm and settled comes to be established is, surprisingly often, not as tight as the confidence around it suggests.
And I hold my own view the same way. I understand perfectly well that I can always be wrong — so if you disagree with what I have written here, I would genuinely welcome hearing it.
In Summary
A gold standard is meant to be the most reliable benchmark medicine has, and one of them says high cholesterol kills. My own LDL keeps putting me on the wrong side of that line while every other marker looks fine, which is reason enough to ask how the line was drawn. The critics argue it was drawn partly by choosing the friendliest data; the mainstream answers that later evidence has more than carried the claim. Both are worth hearing. The lasting lesson is not that the standard is wrong but that even a standard deserves to be asked how it got there — and that includes the standards I hold myself.
Related reading: Does Fat in the Blood Really Clog Arteries? · Cholesterol and Jing (정 精)
This article reflects the clinical observations and teaching practice of Professor Seungho Baek, Professor of Korean Medicine at Dongguk University College of Korean Medicine, specializing in Pathology and Oncology.
