Are Eggs Healthy?
The complete nutritional science. Calories, protein, cholesterol, vitamins — what the research actually shows.
QUICK ANSWER
Yes, for most people. One large egg contains 72 calories, 6.3g of complete protein, and meaningful amounts of vitamin D, choline, B12, and selenium. The science on cholesterol has shifted: the 2020 U.S. Dietary Guidelines removed the old 300mg/day limit. Eggs are one of the most nutrient-dense foods per calorie on the planet.
Egg Nutrition Facts
Per one large egg (50g), raw. Source: USDA FoodData Central.
| NUTRIENT | AMOUNT | % DAILY VALUE |
|---|---|---|
| Calories | 72 kcal | — |
| Total Fat | 4.8g | 6% |
| Saturated Fat | 1.6g | 8% |
| Cholesterol | 186mg | 62% |
| Sodium | 71mg | 3% |
| Total Carbohydrate | 0.4g | 0% |
| Protein | 6.3g | 13% |
| Vitamin D | 41 IU | 10% |
| Choline | 147mg | 27% |
| Vitamin B12 | 0.6mcg | 25% |
| Riboflavin (B2) | 0.2mg | 15% |
| Selenium | 15.4mcg | 28% |
| Phosphorus | 99mg | 10% |
| Folate | 24mcg | 6% |
| Iodine | 25mcg | 17% |
| Zinc | 0.6mg | 5% |
| Lutein + Zeaxanthin | 252mcg | — |
% Daily Values based on a 2,000-calorie diet. Source: USDA FoodData Central (FDC ID 748967).
The Protein Case
Egg protein carries a PDCAAS score of 1.0 — the maximum possible. PDCAAS (Protein Digestibility-Corrected Amino Acid Score) measures both the completeness of a protein's amino acid profile and how well your body actually absorbs it. An egg contains all nine essential amino acids in proportions that closely match human requirements.
Cooking matters. Your body absorbs approximately 91% of protein from cooked eggs, compared to 51% from raw eggs. Heat denatures the proteins, unfolding them into forms that digestive enzymes can break down more efficiently. This is why food scientists use cooked egg protein as the benchmark in protein quality research.
The protein is split almost evenly: 3.6g in the white and 2.7g in the yolk. The white gives you protein with almost no fat; the yolk's 2.7g comes packaged with every fat-soluble vitamin in the egg. Eating whole eggs, not just whites, is the nutritionally complete choice for most people.
Protein per 100 calories — common sources
Source: USDA FoodData Central. Bar represents protein density relative to chicken breast (benchmark).
The Cholesterol Question
A large egg contains 186mg of cholesterol, concentrated entirely in the yolk. For decades, this led to dietary recommendations limiting egg consumption. The science has since moved on.
The key distinction: dietary cholesterol and blood cholesterol are not the same thing. For roughly 70% of people, dietary cholesterol has a minimal effect on LDL blood cholesterol levels. What raises LDL more reliably is saturated fat and trans fat — not the cholesterol in food itself.
The evidence shifted official guidance. The 2020-2025 U.S. Dietary Guidelines for Americans removed the previous 300mg/day cholesterol ceiling, noting that the evidence linking dietary cholesterol to cardiovascular disease is not strong enough to set a specific limit. A 2019 JAMA meta-analysis of 29,615 adults found that consumption of up to one egg per day was not associated with increased cardiovascular disease risk in healthy adults.
The caveat: people with type 2 diabetes or familial hypercholesterolemia (a genetic condition) do appear to have a different response to dietary cholesterol and should discuss egg intake with their doctor. For everyone else, current evidence supports eggs as part of a healthy diet.
"The evidence does not support limiting dietary cholesterol for cardiovascular disease prevention in the general population."
— 2020-2025 Dietary Guidelines Advisory Committee
Vitamins & Minerals Worth Knowing
Choline — 147mg (27% DV)
Choline is essential for brain development, nerve function, and liver health. Most Americans don't get enough. Eggs are the single best dietary source — one egg delivers more choline than almost any other commonly eaten food. Pregnant women need 450mg/day; two eggs gets them 65% of the way there. Source: Institute of Medicine.
Vitamin D — 41 IU (10% DV)
Eggs are one of only a handful of natural food sources of vitamin D. The vitamin D in an egg is in the yolk, in a form (D3) that your body uses more efficiently than plant-based D2 sources. Vitamin D-enriched eggs from hens given supplemented feed can contain 3-4x the standard amount. Source: USDA FoodData Central.
Vitamin B12 — 0.6mcg (25% DV)
B12 is found almost exclusively in animal products. Eggs are a significant source, with most of it concentrated in the yolk. A deficiency in B12 causes fatigue, nerve damage, and megaloblastic anemia — eggs are one of the most accessible dietary prevention strategies, particularly for vegetarians who include eggs.
Selenium — 15.4mcg (28% DV)
Selenium is a trace mineral that acts as an antioxidant and supports thyroid function. One egg provides about 28% of the daily requirement — a meaningful contribution from a single food. The amount varies with the selenium content of hens' feed, which depends on soil conditions where their feed was grown.
Lutein & Zeaxanthin — 252mcg
These carotenoids accumulate in the retina and lens of the eye. Research links them to reduced risk of age-related macular degeneration and cataracts — the leading causes of blindness in older adults. The lutein in eggs is in a fat-rich matrix (the yolk) that makes it significantly more bioavailable than the lutein in leafy greens. Source: American Journal of Clinical Nutrition.
Frequently Asked Questions
For healthy adults, current evidence supports eating up to one egg per day without increased cardiovascular risk. Some studies suggest up to two eggs per day is safe for most people. The 2020 Dietary Guidelines no longer set a specific egg-per-day limit. People with type 2 diabetes or heart disease should consult their doctor.
Egg whites are lower in calories (17 vs. 72) and fat, but the yolk contains virtually all of the egg's vitamins and minerals. Choline, vitamin D, B12, selenium, lutein, and zeaxanthin are all in the yolk. Egg whites are useful for people managing calorie intake, but whole eggs are the nutritionally complete choice.
Marginally, in some cases. Eggs from hens with outdoor access have been shown to contain slightly more vitamin D (from sun exposure) and omega-3s (from foraging). However, the differences are not dramatic — typically 10-30% more for specific nutrients. The primary reason to choose these eggs is animal welfare, not significantly different nutritional outcomes.
No, for most healthy people. Long-term studies of habitual egg eaters do not show increased cardiovascular disease risk at 1 egg/day. The Harvard Nurses' Health Study and Health Professionals Follow-up Study found no significant association between egg consumption and heart disease in healthy men and women.
Current evidence does not support eggs as a pro-inflammatory food. Some studies suggest eggs may have a neutral or modest anti-inflammatory effect, possibly due to lutein, zeaxanthin, and choline. Eggs cooked in inflammatory fats (refined vegetable oils, processed pork products) may be a confounding factor in older research that linked eggs to inflammation.