31/01/2026
In 1958, he told people to eat fat. Medicine called it propaganda. 1.5 million readers called it freedom.
In 1958, a British doctor named Richard Mackarness committed what was, at the time, nutritional heresy.
He told people to stop fearing fat.
He said the real problem wasn’t calories.
It was carbohydrates.
Especially sugar and refined starch.
His book was called Eat Fat and Grow Slim.
Inside it, Mackarness dismantled what he called the calorie fallacy and proposed something radically simple: eat the way humans ate before agriculture rewired the food supply.
Meat.
Fish.
Fat.
Simple vegetables and roots.
No sugar.
No grains.
No soy.
No cow’s milk.
Sound familiar?
This wasn’t keto branding.
This wasn’t influencer science.
This was 1958.
And the response was immediate and predictable.
Dietitians dismissed it as propaganda.
Institutions warned people away from it.
Powerful voices like Ancel Keys mocked it publicly.
Yet something inconvenient happened.
The book sold over 1.5 million copies.
Because people weren’t debating it.
They were getting better.
Mackarness didn’t stop there.
In 1976, he wrote Not All in the Mind, arguing that modern foods like white flour, sugar, and even milk could quietly make people mentally and physically unwell.
He wasn’t guessing.
He had met surgeons and physicians who were already using what he called a “Stone Age” approach to reverse chronic illness long before low-carb had a name.
Doctors who saw the same thing over and over again.
Remove sugar.
Remove refined carbs.
And the body does what it was always designed to do.
Heal.
History didn’t forget this book by accident.
It was buried because it broke the story too early.
And once you see that, you can’t unsee it.