One large chicken egg contains about 186 milligrams of cholesterol, all of it concentrated in the yolk. The egg white has zero cholesterol. That single egg accounts for a significant chunk of what Americans typically consume in a day, since current dietary guidelines recommend keeping cholesterol intake “as low as possible without compromising the nutritional adequacy of the diet.”
Where the Cholesterol Sits
The yolk carries the entire cholesterol load. It also carries most of the egg’s fat, along with nutrients you won’t find in the white: choline (important for brain and liver function), plus lutein and zeaxanthin, two pigments that support eye health. A typical yolk contains roughly 0.17 mg of lutein and 0.08 mg of zeaxanthin. The white, by contrast, is almost pure protein and water.
This is why egg-white omelets became a diet staple. If your only concern is cholesterol, swapping to whites eliminates it entirely while keeping about half the protein. But you lose the yolk’s nutritional package in the process.
How Egg Size Changes the Number
The 186 mg figure applies to a large egg, which is the standard size used in nutrition labeling and most recipes. Smaller eggs contain less cholesterol simply because the yolk is smaller, while jumbo eggs contain more. As a rough guide, cholesterol scales proportionally with yolk size. If you regularly buy jumbo eggs, expect closer to 210 to 230 mg per egg.
Does Eating Cholesterol Raise Your Cholesterol?
This is the question behind the question, and the answer is more nuanced than it used to be. Dietary cholesterol does raise blood cholesterol levels, but modestly. A large analysis of 55 controlled trials found that for every additional 100 mg of dietary cholesterol per day, LDL (“bad”) cholesterol increased by roughly 2 to 5 mg/dL, depending on the statistical model used. A separate meta-analysis of 17 trials found that adding dietary cholesterol raised total cholesterol by about 11 mg/dL, LDL by about 7 mg/dL, and HDL (“good”) cholesterol by about 3 mg/dL.
So cholesterol from eggs does nudge your numbers, but the effect is smaller than most people assume. Your liver produces the vast majority of the cholesterol in your blood, and it adjusts production somewhat when you eat more. That said, not everyone responds the same way. Some people are “hyper-responders” whose blood cholesterol spikes more sharply from dietary sources, while others barely budge. There’s no simple test to know which group you fall into.
One practical wrinkle: in a typical American diet, foods high in cholesterol also tend to be high in saturated fat (think bacon, cheese, butter alongside those eggs). Saturated fat has a stronger effect on LDL than cholesterol itself. So the company your eggs keep on the plate matters as much as the eggs themselves.
Eggs and Heart Disease Risk
Large-scale studies tracking hundreds of thousands of people over years have not found a clear link between eating one egg per day and increased heart disease. A major analysis published in The BMJ, pooling data from three large U.S. cohorts and conducting an updated meta-analysis, found that one egg per day was not associated with higher cardiovascular disease risk (pooled relative risk of 0.98). Results were similar for coronary heart disease specifically (0.96) and for stroke (0.99). In Asian populations, egg consumption was actually associated with slightly lower cardiovascular risk.
These are observational studies, which means they can’t prove eggs are harmless. But across millions of person-years of data, the signal for harm at moderate consumption levels simply isn’t there.
Eggs and Diabetes
People with type 2 diabetes or prediabetes often worry about eggs, since diabetes already increases cardiovascular risk. The evidence here is reassuring. A 2018 Australian study found that eating 12 eggs per week had no adverse effects on cholesterol, blood sugar, or hemoglobin A1C in people with type 2 diabetes. A separate U.S. trial found that one egg per day actually improved fasting blood glucose compared to an egg substitute, with no change in cholesterol. A 2017 review of 10 studies reached the same conclusion: six to 12 eggs per week had no measurable impact on cholesterol, triglycerides, fasting glucose, or insulin in people with diabetes.
All of these studies placed eggs within a broader healthy eating pattern. Eggs alongside vegetables and whole grains tell a different metabolic story than eggs alongside processed meat and refined carbs.
How Cooking Affects Cholesterol
Heat and oxygen can cause cholesterol in eggs to form oxidation byproducts, which some research suggests may be more harmful to blood vessels than cholesterol itself. The effect increases with cooking time and temperature. Eggs cooked at moderate heat for normal durations (a few minutes for scrambled or fried eggs, 10 to 12 minutes for hard-boiled) produce minimal oxidation. Extended high-heat cooking is where oxidation becomes more significant. In one study, eggs heated continuously for 24 hours showed cholesterol oxidation products roughly 1.6 times higher than unheated eggs.
For everyday cooking, this isn’t a major concern. Poaching, soft-boiling, and brief scrambling expose the yolk to less heat and oxygen than prolonged frying. If you’re eating eggs daily, gentler cooking methods are a reasonable habit.
Cholesterol in Other Types of Eggs
Chicken eggs aren’t the only option. Duck eggs are larger and contain more cholesterol per egg, though the concentration per gram of yolk is actually somewhat lower (about 10.8 mg per gram of yolk versus 13.9 mg for chicken eggs). Quail eggs are tiny but often eaten several at a time. Their yolks contain about 7.8 mg of cholesterol per gram, the lowest concentration among commonly consumed eggs. Because quail eggs are so small, a single one has far less total cholesterol than a chicken egg, but five or six quail eggs (a typical serving) bring you into similar territory.
The Practical Bottom Line
At 186 mg of cholesterol, one large egg is a meaningful source, but not the dietary villain it was once made out to be. Previous guidelines drew a hard line at 300 mg per day. Current federal guidelines dropped that specific cap, instead recommending you keep dietary cholesterol low within the context of a healthy overall eating pattern. For most people, one egg a day fits comfortably within that framework. If you eat two or three eggs at a sitting, you’re consuming 370 to 560 mg of cholesterol in one meal, which is worth being mindful of, especially if the rest of your diet is also high in animal fats.