For decades, the egg sat at the center of one of the most consequential nutrition mistakes in American medical history. Doctors advised patients to limit them, dining halls pulled them from buffets, and generations of Americans ate egg-white omelets while the yolk went to waste. The advice was well-intentioned. It was also wrong.
The reversal is documented in peer-reviewed research published by the NIH and confirmed in the 2015 Dietary Guidelines, which removed the cholesterol limit entirely for the first time since it was introduced in 1968. National Geographic covered the science behind the shift in March 2026, and the AOCS published a detailed analysis of how the original guidance went wrong.
The story starts with one researcher’s flawed study and ends with millions of people who avoided one of the most nutritious foods available for no defensible reason.
The ban
In the 1950s, a cardiologist named Ancel Keys proposed that saturated fat raised blood cholesterol and that high cholesterol caused heart disease. The policy world ran with it. By 1968, the American Heart Association had issued what the NIH later called the most well-known in the world: no more than three egg yolks per week and no more than 300 milligrams of dietary cholesterol per day. That guidance held for nearly 50 years.
The problem was that Keys himself later found that dietary cholesterol had a relatively small effect on blood cholesterol compared to saturated fat. But the egg had already become the public symbol of a limit that was always more about cooking fat than the egg itself.
The science
A large egg contains 186 milligrams of cholesterol. That sounds alarming against the old 300-milligram daily ceiling. But the body does not work that way. According to National Geographic, the biggest dietary driver of blood cholesterol is not cholesterol in food but saturated fat. Saturated fat raises LDL cholesterol by hindering the liver’s ability to remove it from the blood. Eggs contain relatively little saturated fat compared to butter, full-fat dairy, and red meat, which the 2025-2030 Dietary Guidelines continue to recommend limiting.
In 2013, the AHA and ACC published a report concluding there was insufficient evidence to determine whether lowering dietary cholesterol reduced LDL cholesterol. Two years later, the 300-milligram limit was gone.
What eggs actually contain
The NIH review describes eggs as one of the most nutrient-dense foods available. High-quality protein, B vitamins, choline, lutein, zeaxanthin, and fat-soluble vitamins A, D, E, and K are all present. Choline supports brain function and is particularly important in aging adults, a population that was advised to avoid eggs precisely when they needed the nutrient most.
Where things stand now
The AHA now says one egg daily is acceptable for healthy adults. For people with diabetes or specific cardiovascular conditions, the picture is more nuanced, and a physician’s guidance applies. What is no longer contested is that the blanket ban was wrong, that dietary cholesterol was not the driver of heart disease, it was portrayed to be, and that the thing you cook an egg in matters considerably more than the egg itself.
Wrap up
Fifty years of public health advice steered people away from a food that was nutritious, affordable, and convenient. The reversal did not happen overnight because reversals in dietary guidance rarely do. But the science is now clear. The egg was not the problem.
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