1967 · Ancel Keys
Seven Countries
What this work is
A report from the Seven Countries Study, which followed groups of middle-aged men in Finland, the Netherlands, Italy, Yugoslavia, Greece, Japan, and the United States. Diets were surveyed, blood cholesterol measured, and heart disease recorded over the following years. Keys compares the groups and reports that those eating more saturated fat had higher cholesterol and more coronary disease.
Then and now
Keys showed that coronary death rates tracked blood cholesterol across seven countries. Cardiology made the study a foundation of low-fat diets and cholesterol-lowering drugs. A pattern across countries never showed cholesterol causing heart disease, and nobody has seen that.
Verdict
UNSCIENTIFIC
Neither the paradigm nor the work inside it passes. The verdict is unscientific.
1·This work · inside the paradigm
UNSCIENTIFIC
Does not follow the scientific method within Diet-Heart Hypothesis.
2·Paradigm · Diet-Heart Hypothesis
UNSCIENTIFIC
Fails the tests. The worse layer decides.
How the verdict is decided
The verdict grades both layers: the paradigm this work assumes, and how the work was carried out inside it. Both must be scientific for the whole thing to be scientific. A clean method inside an unscientific paradigm is unscientific. An unscientific method inside a better paradigm is unscientific. A split on either layer is mixed. The worse layer decides.
1·This work
Did this work test its claim with methods that are independent, falsifiable, and non-circular?
UNSCIENTIFIC
This work claims that comparing men in seven countries on blood cholesterol, blood pressure, body weight, and smoking shows which of these bear on the cause of coronary heart disease. All three tests fail.
Independently Verifiable
Fail
The study counted deaths classified as coronary heart disease using diagnostic categories that the paper itself admits are applied differently across countries, and measured serum cholesterol using chemical assays that assume the cholesterol model.
Falsifiable
Fail
The paper lists overweight, blood pressure, cholesterol, exercise, and smoking as candidate causes, so if cholesterol shows no association the field can attribute the difference to any of the other variables rather than questioning the hypothesis.
Non-Circular
Fail
The disease category the study counts was defined by the same diagnostic model the study claims to support, and the paper admits that what gets labeled coronary in one country gets labeled cerebrovascular in another.
Why
The outcome is death labeled coronary, which the paper admits is labeled differently from country to country, and the exposure is an assay the model reads as cholesterol. With five candidate causes listed, a miss on cholesterol can always go to the others. The disease the study counts is defined by the model the study supports.
2·Paradigm · Diet-Heart Hypothesis
Does the framework this work assumes pass the three tests?
UNSCIENTIFIC
Independently Verifiable
Fail
The diet-heart paradigm defines coronary heart disease using model-dependent diagnostic categories and measures cholesterol using chemical fractions interpreted through the model, so the observation only exists after the model has been accepted.
Falsifiable
Fail
When a country's cholesterol levels do not match its heart disease rates, the paradigm calls it confounders, lifestyle factors, or classification differences rather than evidence the hypothesis is wrong.
Non-Circular
Fail
The paradigm names the disease, builds the test that detects the disease, measures the chemical it claims causes the disease, and then cites the correlation as proof the model is correct.
Why
The diet-heart hypothesis says dietary fat and blood cholesterol cause heart disease, and this study is one of its foundations. The hypothesis defines coronary disease by labels that change by country and doctor, measures cholesterol by assays read through the model, compares the two, and calls the match evidence. Countries that do not fit become confounders or classification errors. France eats fat and has little heart disease, and the field named that a paradox and moved on.
From the work
Cases of sudden death that would be labelled "coronary" in some countries (e.g., U.S.A. and Finland) may be certified as "cerebrovascular" in some other countries (e.g., Japan).
Among characteristics suggested to be contributory to the development of coronary heart disease, importance is frequently attributed to overweight or obesity, elevated blood pressure, high concentration of cholesterol in the blood, lack of physical exercise, and the habit of cigarette smoking.