Egg Nutrition Facts: Complete Protein, Choline, and the Cholesterol Update

One large egg (about 50 grams, whole, hard-boiled) delivers 78 calories, 6.3 grams of complete protein, 147 milligrams of choline, and 186 milligrams of cholesterol. Across nearly every evidence-based diet — Mediterranean, DASH, paleo, keto — the egg has earned status as a nutritional cornerstone. Yet myths around dietary cholesterol persist.

This guide sources every number directly from USDA FoodData Central (large egg, hard-boiled, NDB 01129) and the 2020–2025 Dietary Guidelines for Americans, and explains the latest science on cholesterol, choline, and when whole egg trumps whites.

Egg Nutrition Facts (per 1 large egg, 50g & per 100g whole egg)

Nutrient	Per 1 Egg (50g)	Per 100g	% DV*
Calories	78 kcal	155 kcal	8%
Total Fat	5.3 g	10.6 g	14%
— Saturated Fat	1.6 g	3.3 g	17%
— Polyunsaturated Fat	0.7 g	1.5 g	—
— Monounsaturated Fat	2.0 g	4.1 g	—
Cholesterol	186 mg	373 mg	62%
Carbohydrates	0.6 g	1.1 g	<1%
— Dietary Fiber	0 g	0 g	—
Protein	6.3 g	12.6 g	13%
Choline	147 mg	293 mg	27% (women), 23% (men)
Vitamin D (cholecalciferol)	22 IU	44 IU	6%
Vitamin B12 (cobalamin)	0.6 µg	1.2 µg	25%
Riboflavin (B2)	0.26 mg	0.51 mg	20%
Selenium	30.7 µg	61.4 µg	56%
Lutein + Zeaxanthin	~190 µg	~380 µg	—

*Daily Values (DV) based on 2,000-calorie diet (FDA). Individual needs vary. Data: USDA FoodData Central, hard-boiled large egg.

For scrambled eggs, boiled eggs, or fried eggs (in minimal oil), macronutrient totals remain nearly identical; cooking method has minimal impact on protein, fat, or mineral content (though high-heat frying may slightly oxidize cholesterol).

Complete Protein with a Perfect Score (PDCAAS 1.0)

Eggs are one of only a handful of foods with a Protein Digestibility-Corrected Amino Acid Score (PDCAAS) of 1.0 — the highest possible. This means:

1. All nine essential amino acids are present in ratios matched to human requirements (leucine, isoleucine, valine, methionine, phenylalanine, threonine, tryptophan, histidine, lysine).
2. Digestibility is 97% — your body absorbs almost all the protein you consume, unlike plant proteins (soy: 91–95%; wheat: 86%; legumes: 72–90%).
3. The amino acid profile supports muscle synthesis across all life stages — children, athletes, older adults, and post-surgery patients.

One large egg (6.3g protein) is equivalent in amino acid completeness to 8 ounces of lean beef or a full glass of milk. Two eggs cover ~20% of an adult’s daily protein requirement (46–56g, depending on sex and body weight). For this reason, eggs are the reference standard against which other protein sources are measured.

Choline: Eggs Are a Rare Dietary Source

Choline is classified as an essential nutrient — your body cannot manufacture sufficient quantities, so dietary intake matters. The Recommended Dietary Allowance (RDA) is:

• 425 mg per day for adult women
• 550 mg per day for adult men

One large egg provides 147 mg of choline — mostly in the yolk — which covers 27% of a woman’s daily RDA and 23% of a man’s. Here’s the problem: approximately 90% of the U.S. adult population consumes less choline than recommended (NHANES data, NIH Office of Dietary Supplements).

Why does this matter? Choline is a precursor for the neurotransmitter acetylcholine (essential for memory and cognition), a component of cell membranes (phosphatidylcholine), and a methyl-group donor in DNA synthesis and methylation. Deficiency has been linked to:

• Impaired fetal neural development (if deficient during pregnancy)
• Elevated homocysteine levels (cardiovascular risk marker)
• Reduced cognitive performance in aging populations

Outside eggs, meaningful dietary sources of choline are sparse: beef liver (~400 mg per 3 oz), chicken breast (~15 mg per 3 oz), broccoli (~62 mg per cup), and soy products. Two eggs per day easily covers the RDA without supplementation and is far more economical than choline supplements.

The Cholesterol Myth Update: Why Dietary Cholesterol Is No Longer Capped

For decades, health organizations recommended limiting dietary cholesterol to 300 mg per day. A large egg’s 186 mg of cholesterol made it a “sometimes food.” This guidance was based on the assumption that dietary cholesterol directly raises blood LDL cholesterol and increases heart disease risk.

This assumption has been revised by robust evidence. In 2015, the U.S. Dietary Guidelines Advisory Committee concluded:

“Cholesterol is not considered a nutrient of public health concern for overconsumption.”

The 2015–2020 (and 2020–2025) Dietary Guidelines for Americans removed the 300 mg cap entirely.

What the science actually shows:

1. Dietary cholesterol has a minimal effect on LDL cholesterol in most people. A meta-analysis of 21 randomized controlled trials (Drouin-Chartier et al., 2020, BMJ) found that each 200 mg increase in daily dietary cholesterol raised LDL cholesterol by only ~1.9 mg/dL — a trivial change for most individuals.

2. Genetics determine how strongly dietary cholesterol affects blood cholesterol. Some people are “hyper-responders” (~25% of the population), but identifying them requires a simple blood test, not universal avoidance of eggs.

3. Whole-egg consumption does not increase cardiovascular risk in healthy adults. Large prospective cohorts (Framingham Heart Study, Nurses’ Health Study, Health Professionals Follow-up Study) found no association between moderate egg consumption (up to one egg per day) and heart disease or stroke in people without diabetes or severe dyslipidemia.

4. Eggs raise HDL cholesterol (the “good” kind) and improve the total:HDL ratio. In studies where LDL does rise slightly with egg consumption, HDL rises more, leaving the cardiovascular risk profile either neutral or improved.

Who should still limit dietary cholesterol?

Only a small subset:

• Familial hypercholesterolemia (FH) — a genetic condition affecting ~1 in 250 people. These individuals are extremely sensitive to dietary cholesterol and may need to restrict intake or use statin therapy.
• Uncontrolled diabetes with severe dyslipidemia — some diabetics are sensitive to dietary cholesterol’s effect on LDL; consult a dietitian or cardiologist.

For everyone else, one to two whole eggs per day fits standard cardiovascular and metabolic guidance.

Whole Egg vs. Egg White: What You’re Actually Choosing

The white of a large egg contains 3.6 grams of protein and ~17 calories. The yolk contains 2.7 grams of protein, 5 grams of fat, and ~61 calories. On the surface, whites look like a leaner choice. But this ignores the yolk’s nutrient density:

Nutrient	Yolk	White
Choline	~143 mg	~1 mg
Lutein + Zeaxanthin	~185 µg	~0 µg
Vitamin D	~20 IU	~0 IU
Selenium	~30 µg	~1 µg
Vitamin B12	~0.58 µg	~0.02 µg
Riboflavin (B2)	~0.25 mg	~0.01 mg
Fat-soluble vitamin absorption	Excellent (fat present)	None (no fat)

The yolk is where all the micronutrient action happens. It houses the fat-soluble vitamins (A, D, E, K) and the carotenoids lutein and zeaxanthin (which protect eye health). None of these nutrients are bioavailable in the white.

When to eat whole eggs:

• Most of the time. A whole egg provides optimal protein-to-micronutrient density for a 78-calorie investment.
• Pregnant or nursing women. Choline is critical for fetal and infant brain development; whole eggs are among the easiest sources.
• Older adults or those with age-related macular degeneration (AMD) risk. Lutein and zeaxanthin slow AMD progression; yolks are rich sources.
• Those with low choline intake. If other dietary sources (liver, fish, cruciferous vegetables) are scarce, whole eggs are the most practical solution.

When egg whites make sense:

• Extreme calorie restriction (e.g., competitive bodybuilding cut). Two egg whites (7 g protein, 34 kcal) plus one whole egg (6.3 g protein, 78 kcal) = 13 g protein, 112 kcal — a leaner ratio than three whole eggs (19 g protein, 234 kcal).
• Dietary fat intolerance or malabsorption disorders. If you cannot digest fat (cystic fibrosis, post-gallbladder removal), whites provide pure protein without fat.
• Those on extreme low-fat diets (e.g., therapeutic high-carb protocols for certain conditions). Rare; most modern dietetics support moderate fat intake.

Most healthy individuals benefit from at least one whole egg per day in order to meet choline and lutein needs.

How Many Eggs Should You Eat Per Day?

Evidence-based consensus guidelines:

• Up to one whole egg per day — a standard clinical recommendation for most healthy adults. Covers 13% of daily protein and 27% of choline RDA.
• Two eggs per day — reasonable for athletes, those in muscle-gain phases, or people meeting choline RDA goals. Total ~156 kcal, 12.6 g protein, 294 mg choline. Fits within standard fat budgets (USDA 20–35% of calories).
• Three or more per day — not harmful by evidence, but calorically dense. Athletes and very-high-protein dieters may use this; most sedentary individuals are better served at one to two eggs plus other protein sources.

No evidence-based upper limit on eggs exists for healthy, non-diabetic adults. The 2020–2025 Dietary Guidelines place no egg cap.

When Eggs Might Not Fit Your Diet

Egg allergy

Affects ~1–2% of children (often resolves by adulthood) and <0.5% of adults. True egg allergy involves IgE antibodies to ovomucoid or ovalbumin; symptoms range from oral itching to anaphylaxis. Avoid entirely if allergic.

Raw or undercooked eggs + pregnancy

Raw egg whites carry salmonella risk; though salmonella is primarily a concern for very young children and immunocompromised individuals, pregnant women should avoid raw eggs due to fetal vulnerability to infection. Cook eggs to 160°F (71°C) to eliminate salmonella.

Familial hypercholesterolemia

Those with confirmed FH (1 in 250 people) may need to limit dietary cholesterol, including eggs. Genetic testing and cardiology consultation are appropriate.

Egg-free diets (vegan)

Plant-based diets exclude eggs; alternative complete proteins include soy, hemp, quinoa, and legume combinations.

The Bottom Line

One large egg: 78 calories, 6.3 grams of complete protein (PDCAAS 1.0), 147 milligrams of choline (27% DV), and 186 milligrams of cholesterol (which has minimal cardiovascular impact for most healthy adults). The yolk is nutritionally superior to the white; whole-egg consumption is supported by nearly four decades of observational and clinical evidence. Eggs are among the most nutrient-dense and affordable sources of complete protein, choline, and selenium on the grocery shelf. The only reasonable limit is individual tolerance, caloric budget, or documented genetic cholesterol sensitivity — not arbitrary portion caps.