Fat or fiction: the diet-heart hypothesis

Another team of prominent cardiologists have called for a rethink of the diet-heart hypothesis in a new BMJ paper, adding to mounting evidence that it is flawed and yet governments have allowed it to form the basis of most countries’ low-fat dietary advice for decades.


The concept that diet, serum cholesterol and cardiovascular disease are causally related gave rise to the diet-heart hypothesis nearly 70 years ago. This hypothesis postulates that reducing dietary saturated fat reduces serum cholesterol, thereby reducing the risk of cardiovascular disease.

Today, this concept has been transformed from a hypothesis into public health policy as current guidelines recommend reducing the intake of dietary saturated fat. Not all practitioners agree, however, and a reappraisal of the evidence may help resolve this controversy.

An abbreviated history

Dr Ancel Keys first proposed the diet-heart hypothesis in the 1950s. Several years later, he published the Seven Countries Study that reported a strong correlation between dietary fat and coronary mortality in seven countries.

His hypothesis rapidly gained support and by 1977 the US Senate Select Committee on Nutrition and Human Needs formally recommended that Americans should reduce their consumption of total and saturated fat.

Many scientists disagreed and a vitriolic debate soon followed. Presently, the American Heart Association recommends ‘lowering intake of saturated fat and replacing it with unsaturated fats, especially polyunsaturated fats’ to reduce cardiovascular disease.

Fat and cholesterol

Low-density lipoprotein-cholesterol is a cholesterol-containing multi-molecular complex often targeted for reduction because of its central role in atherosclerosis, yet cholesterol is essential for life as a key constituent of cell membranes and bile acids and …

This journal has a paywall… view the full article here: thttps://ebm.bmj.com/content/early/2019/06/22/bmjebm-2019-111180

Here, however, are its conclusions:


DuBroff R, de Longeril M
Fat or fiction: the diet-heart hypothesis
BMJ Evidence-Based Medicine
Published Online First: 29 May 2019. doi: 10.1136/bmjebm-2019-111180

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