You probably grew up hearing that eggs are bad for your heart. Maybe your doctor once told your parents to switch to egg whites. For years, the yolk was treated as something to fear at the breakfast table.
Here is what the current science says. For most healthy adults, eating up to one egg a day does not meaningfully raise LDL cholesterol or heart disease risk.
That is the picture laid out by the Harvard T.H. Chan School of Public Health Nutrition Source. It notes that cholesterol in food has a smaller effect on blood LDL than the mix of fats in your diet.
The old rule, limit dietary cholesterol to 300 mg a day, came from a simple assumption. If food cholesterol raises blood cholesterol, eating less of it should protect your heart. The research never quite fit that neat story.
Also read: Congo's deadliest Ebola is still spreading: A vaccine trial begins this month
Why your liver is the real cholesterol thermostat
Your body makes most of its own cholesterol. When you eat more of it, the liver tends to make less, which cushions the effect on your blood. Harvard describes dietary cholesterol and blood cholesterol as only weakly related.
Saturated and trans fats are the stronger drivers of LDL, the particle most tied to clogged arteries. A large egg yolk has about 200 mg of cholesterol and 5 grams of fat, mostly the unsaturated kind, with only a modest amount of saturated fat compared to red meat or butter.
The American Heart Association backed this shift in a 2019 Science Advisory in Circulation. It stopped setting a specific daily cholesterol number for healthy adults and asked people to focus on overall diet quality.
What the biggest studies actually found
A 2020 meta-analysis in the BMJ pooled data from more than 1.7 million people across cohort studies worldwide. An extra egg a day was not linked to a higher risk of cardiovascular disease.
Also read: Good reasons to add more cinnamon to your daily diet
Three large US cohorts analyzed inside the same paper, covering 215,618 nurses and health professionals followed for decades, pointed in the same direction for healthy adults.
That lines up with older evidence Harvard cites, including the Physicians' Health Study, in which up to one egg a day was not tied to heart disease in people without diabetes.
Who should still be careful
The green light is not for everyone. In the diabetes-only part of the BMJ meta-analysis, high egg intake was linked to a roughly 40 percent higher relative risk of cardiovascular disease than low intake. The authors noted a lot of variation between studies.
Harvard's Nutrition Source draws a similar line. In the Nurses' Health Study and the Health Professionals Follow-up Study, heart disease risk rose among men and women with diabetes who ate one or more eggs a day.
Also read: Adult ADHD may matter more for how your brain ages than anyone realized
People with familial hypercholesterolemia, an inherited form of very high LDL, and those who already struggle to control their cholesterol may also see a bigger rise in LDL from dietary cholesterol.
The Harvard page recommends they be cautious about egg yolks and talk to a doctor.
What this means for your breakfast
For most people, one egg a day is a reasonable baseline. Scrambled in butter next to bacon is a different story than poached on whole-grain toast. The saturated fat on your plate, not the cholesterol inside the yolk, is doing most of the work on your blood lipids.
How you cook the egg matters too. This is the healthiest way to cook eggs for your heart is a shorter path to a heart-friendly result than the egg itself.
Also read: Under 4 hours a week of helping others may delay Alzheimer's by nearly 2 years in high-risk group
If you have type 2 diabetes, high LDL that will not come down, or a family history of early heart disease, ask your doctor where eggs fit into your weekly eating pattern.
Also read: What really happens when you take Ozempic? Celebrities share their stories
This article is made and published by Jesper Bengtson, who may have used AI in the preparation.