The short version
A large egg contains about 186mg of dietary cholesterol, all of it in the yolk (USDA FoodData Central). For most healthy adults, dietary cholesterol has a much smaller effect on blood cholesterol than saturated fat does. The 2015 and 2020 US Dietary Guidelines dropped the "300mg dietary cholesterol per day" cap that had been in place since 1961, because the evidence stopped supporting it.
Why the story keeps changing
The eggs-are-bad narrative came from mid-20th-century observational studies that found people who ate more animal fat had more heart disease. Egg yolks are animal fat, and they contain a lot of cholesterol, so eggs got lumped in.
What later research separated out: dietary cholesterol (the cholesterol you eat) and blood cholesterol (what circulates in your body) are only loosely related for most people. The liver produces about 80% of your blood cholesterol on its own, and it down-regulates production when you eat more. The exception: a subset of people called hyper-responders — roughly 25% of the population — whose blood cholesterol does move noticeably with dietary intake.
What USDA actually shows for a large egg
Per one large (50g) egg, cooked, USDA data (FDC ID 748967) puts it at approximately:
- 72 calories
- 6.3g protein
- 4.8g fat (1.6g saturated)
- 186mg cholesterol
- 62mg choline (about 11% of daily target)
- Meaningful vitamin D, B12, selenium
The saturated fat line — 1.6g — matters more for cardiovascular risk than the 186mg cholesterol line, based on current consensus.
What the current dietary guidance says
The Dietary Guidelines for Americans 2020–2025 no longer sets a specific cholesterol limit but recommends "consuming as little dietary cholesterol as possible while consuming a healthy eating pattern." That's a hedge — the guidance panel acknowledged the evidence for a hard cap wasn't strong enough to keep it, but didn't want to signal "eat unlimited eggs."
Practically: most cardiology and nutrition organizations now say 1 egg per day is fine for most healthy adults, and even 2 eggs per day appears neutral in meta-analyses of adults without existing heart disease. For people with type 2 diabetes or a family history of cardiovascular disease, the picture is less settled — some studies show a slightly elevated risk at 1+ egg per day, others don't.
What actually affects your blood cholesterol more
If you're trying to lower LDL cholesterol, the leverage is bigger elsewhere:
- Saturated fat (fatty cuts of meat, butter, coconut oil) has a stronger LDL-raising effect than dietary cholesterol.
- Trans fats (partially hydrogenated oils — mostly banned in the US since 2018, but check labels on imported baked goods) raise LDL and lower HDL.
- Soluble fiber (oats, beans, apples, psyllium) actively lowers LDL.
- Weight loss, exercise, and quitting smoking all move your numbers more than tweaking egg consumption.
The honest takeaway
An egg a day is fine for most healthy adults. The evidence that dropped it from villain status is solid enough that the US Dietary Guidelines removed the cholesterol cap. If you have existing heart disease, diabetes, or a family history that concerns you, talk to a doctor — the picture is less settled for you and the answer might be personalized.
And if you're eating eggs with a side of bacon on buttered toast every morning, the eggs aren't the problem.