Do eggs clog your arteries? What the science actually found

For decades we were told eggs spike your cholesterol. The large studies tell a different story.

By CalorIA Scan · July 6, 2026 · 2 min read

Where the fear came from

The logic looks airtight: eggs are high in cholesterol, high blood cholesterol clogs arteries, so eggs must be bad. For years that chain seemed obvious — people were even told to cap their eggs at a few per week.

The catch is that the body isn't that linear. Your liver makes most of the cholesterol in your blood. When you eat more cholesterol, your body tends to make less to compensate.

What the large studies say

Harvard's School of Public Health sums up the evidence like this: dietary cholesterol and blood cholesterol are "only weakly related," and "up to one egg per day is not associated with increased heart disease risk" in healthy individuals — a conclusion drawn from studies of nearly 120,000 participants.

The bigger driver of your blood cholesterol isn't the cholesterol on your plate, it's the mix of fats in your diet: mainly saturated and trans fats. In other words, the problem is rarely the egg itself — it's the bacon, sausage and fried bread next to it.

The fine print: not everyone is the same

Eggs aren't a free pass for everyone. Harvard notes that in people with diabetes, eating one or more eggs a day was linked to higher heart risk, and advises moderation. And eating well over one egg a day could raise the risk of heart failure over time.

That's why US dietary guidelines removed the old 300 mg/day cholesterol cap starting with the 2015–2020 edition: the evidence no longer supported it. "No numeric limit" doesn't mean "eat unlimited" — it means cholesterol stopped being the main villain.

The practical takeaway

For most healthy people, an egg a day fits a balanced diet, with quality protein and good nutrients. If you have diabetes, high cholesterol or heart disease, talk to your doctor about your case. And if you track your macros, log the egg the way you actually cook it: scrambled in oil isn't the same as boiled.

Sources

1. Harvard T.H. Chan — The Nutrition Source: Eggs
2. Dietary Guidelines for Americans

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This article is informational and not medical advice. Consult a doctor or registered dietitian before changing your diet, especially with a pre-existing condition.