A single large egg contains 72 calories, 6 grams of protein, 5 grams of fat, and less than 1 gram of carbohydrates. That compact package also delivers meaningful amounts of more than a dozen vitamins and minerals, making eggs one of the most nutrient-dense foods available for their size and cost.
Protein, Fat, and Calories
The 6 grams of protein in a large egg come with a high biological value, meaning your body can use a large proportion of it for muscle repair and other functions. About 5 grams of fat round out the macronutrient profile, with roughly 40% of that fat being monounsaturated, the same heart-friendly type found in olive oil and avocados. The remaining fat is split between saturated and polyunsaturated types. With virtually no carbohydrates, eggs fit easily into low-carb and ketogenic eating patterns.
Vitamins That Stand Out
Eggs are one of the few natural food sources of vitamin D, providing about 1.3 micrograms per large egg (roughly 63 grams of edible weight). That’s a modest but useful contribution toward the 15 micrograms most adults need daily, especially for people who get limited sun exposure. A single egg also supplies about 0.6 micrograms of vitamin B12, covering roughly a quarter of the daily requirement. B12 is essential for nerve function and red blood cell production, and it’s found almost exclusively in animal foods.
Folate shows up at about 30 micrograms per egg. While that won’t meet the 400-microgram daily target on its own, it adds up when eggs are part of a varied diet, particularly during pregnancy when folate needs increase.
Choline: The Nutrient Most People Miss
One large egg delivers roughly 150 to 185 milligrams of choline, a nutrient that supports liver function, brain signaling, and cell membrane structure. The recommended daily intake is 550 milligrams for men and 425 milligrams for women, so two eggs at breakfast cover a significant share. Most Americans fall short of their choline needs because few foods contain it in concentrated amounts. Liver and soybeans are other good sources, but eggs are the most commonly eaten one.
Choline is especially important during pregnancy. Research published in the journal Nutrients found that maternal intake of eggs and the nutrients they contain showed synergistic associations with fetal brain development, meaning the combination of choline with other egg nutrients like lutein and omega-3 fats appeared to benefit the developing brain more than any single nutrient alone.
Yolk vs. White: Where the Nutrients Live
Egg whites get attention for being pure protein with almost no fat, but the yolk is where the nutritional complexity lives. All of the egg’s cholesterol, fat-soluble vitamins (A, D, E, K), choline, and carotenoids are in the yolk. The white contributes about half the total protein and very little else. Gram for gram, the yolk actually contains more protein than the white: 15.9% protein by weight compared to 10.9% for the white.
If you’re eating only egg whites to cut calories, you’re saving about 55 calories per egg but giving up the majority of its nutritional value. For most people, whole eggs are the better choice.
Eye Protection From Lutein and Zeaxanthin
Egg yolks contain lutein and zeaxanthin, two pigments that accumulate in the retina and help filter damaging blue light. These compounds are linked to a lower risk of age-related macular degeneration, the leading cause of vision loss in older adults. While leafy greens like spinach and kale contain more of these pigments per serving, the fat in egg yolks makes them easier for your body to absorb.
A study in older adults found that eating one egg per day for five weeks raised blood levels of lutein by 26% and zeaxanthin by 38%, without increasing cholesterol or other blood lipid levels.
Cholesterol: What the Evidence Says
One large egg contains about 186 milligrams of cholesterol, all of it in the yolk. Current dietary guidance recommends keeping cholesterol intake under 300 milligrams per day. For years, this made eggs a target of concern, but the picture has shifted considerably.
Most healthy people can eat up to seven eggs a week without increasing their risk of heart disease. For those whose diets are otherwise low in cholesterol, an egg a day is generally a reasonable choice. The exception worth noting: some research suggests that people with diabetes who eat seven eggs a week may face a higher risk of heart disease, so moderation may matter more in that group.
Omega-3 and Omega-6 Fats
Standard commercial eggs have a high ratio of omega-6 to omega-3 fatty acids, roughly 30:1. Since most Western diets already skew heavily toward omega-6, regular eggs don’t do much to improve that balance. Omega-3 enriched eggs, produced by feeding hens flaxseed or fish oil, bring the ratio down dramatically to around 3:1, which is much closer to the balance associated with lower inflammation. If omega-3 intake is a priority for you, these specialty eggs deliver a meaningful difference.
Why Cooking Matters for Absorption
Raw eggs might seem like a shortcut for smoothies or muscle-building shakes, but cooking makes a dramatic difference in how much protein your body actually absorbs. A study using isotope-tracing techniques found that cooked egg protein had a true digestibility of about 91%, while raw egg protein dropped to just 51%. That means nearly half the protein in a raw egg passes through your digestive system unused. Cooking also eliminates the risk of salmonella, which makes it the better choice on both counts.
The cooking method you choose has less impact on nutrient retention than whether the egg is cooked at all. Boiling, poaching, and scrambling all preserve the bulk of the egg’s vitamins and minerals. Frying adds extra calories from oil or butter, but doesn’t significantly damage the nutrients inside the egg itself.