Eggs are one of the most popular foods in the world. They are affordable, easy to cook and can be used in breakfast, lunch, dinner, baking and desserts. They also pack a lot of nutrition into a small package. For decades, eggs were also the subject of debates about cholesterol and heart health. Here's what you need to know, from nutrients and research to cooking and safe handling.
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This article is for general information and does not replace advice from a doctor or registered dietitian.
Anatomy of an egg
- Shell: made mainly of calcium carbonate, with thousands of tiny pores that allow air and moisture to pass.
- Membranes: thin layers just inside the shell that help protect against bacteria.
- Air cell: a small pocket of air at the wide end, which grows as the egg ages.
- White (albumen): mostly water and protein.
- Yolk: contains most of the fat, vitamins, minerals and cholesterol.
- Chalazae: twisted strands that hold the yolk in the center.
Nutrition facts
A large egg contains roughly:
- About 70 to 80 calories.
- About 6 grams of high-quality protein, containing all the essential amino acids the body needs.
- About 5 grams of fat, mostly unsaturated.
- Vitamins: B12, riboflavin (B2), vitamin A, vitamin D and others.
- Minerals: selenium, phosphorus and iron.
- Choline: a nutrient important for brain development and liver function, especially relevant during pregnancy.
- Lutein and zeaxanthin: antioxidants found in the yolk that are linked to eye health.
Most of the vitamins, minerals and fat are in the yolk, while the white is mostly protein and water. Eating the whole egg provides the most complete nutrition.
Health benefits
- Satiety: the protein in eggs can help you feel full longer, which may help with appetite control.
- Muscle maintenance: high-quality protein supports muscles, especially when combined with physical activity, and is important for older adults.
- Nutrient density: eggs provide many nutrients for relatively few calories.
- Accessibility: eggs are one of the most affordable sources of high-quality protein.
- Versatility: they make it easier to prepare quick, balanced meals.
What about cholesterol?
Egg yolks contain dietary cholesterol, about 185 milligrams in a large egg. For many years, people were advised to strictly limit eggs. Current research suggests that, for most healthy people, dietary cholesterol has a smaller effect on blood cholesterol than once believed; saturated and trans fats have a stronger influence. U.S. dietary guidelines no longer set a specific daily limit on dietary cholesterol, but they recommend keeping intake low within a healthy eating pattern.
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What you eat with eggs also matters. Eggs cooked with lots of butter and served with processed meats are very different from eggs cooked with little fat and served with vegetables and whole grains.
People with diabetes, heart disease or high cholesterol should ask their doctor how many eggs fit their diet.
Are brown eggs better?
No. Shell color depends on the breed of hen and does not change the nutritional value or flavor in any significant way. Labels such as "free-range," "pasture-raised" or "organic" refer to how hens are raised and fed, which can matter for animal welfare and personal preferences. Some eggs are enriched with omega-3 fatty acids through the hens' diet.
Popular ways to cook eggs
Boiled
Soft-boiled eggs have a runny yolk; hard-boiled eggs are cooked until firm. Cooling hard-boiled eggs in cold water makes them easier to peel and helps prevent a greenish ring around the yolk.
Scrambled
Quick and easy to combine with vegetables, herbs and cheese. Cooking on low heat produces creamier results.
Poached
Cooked in simmering water without added fat. Fresh eggs hold their shape better.
Fried
Sunny-side up, over easy or over hard. Using a non-stick pan reduces the amount of oil needed.
Omelet
A great way to add vegetables, herbs and lean proteins.
Baked
In muffins, frittatas and dishes like shakshuka, where eggs are cooked in a tomato sauce.
Eggs in baking
Eggs give structure, moisture and richness to cakes, breads and pastries. They also help bind ingredients and create foams in recipes like meringues.
How to tell if an egg is fresh
- Check the date on the carton.
- Float test: place the egg in a bowl of water. Very fresh eggs sink and lie flat; older eggs tilt or stand upright because the air cell has grown. Eggs that float should be discarded.
- Smell: a bad egg has an unmistakable odor when opened.
Storage
- In the United States, commercial eggs are washed, which removes a natural protective coating, so they must be refrigerated.
- Keep eggs at 40°F (4°C) or below.
- Store them in their original carton in the main part of the fridge, not in the door, where temperatures vary more.
- Hard-boiled eggs should be refrigerated and eaten within about a week.
Food safety tips
Raw eggs can carry Salmonella bacteria, which can cause food poisoning.
- Buy eggs that are refrigerated, with clean, uncracked shells.
- Cook eggs until the whites and yolks are firm, especially for children, older adults, pregnant people and anyone with a weakened immune system.
- Avoid foods with raw or undercooked eggs, such as homemade mayonnaise or raw cookie dough, unless they are made with pasteurized eggs.
- Wash hands, utensils and surfaces after handling raw eggs.
- Don't leave egg dishes at room temperature for more than two hours.
Eggs and allergies
Egg allergy is one of the most common food allergies in children, although many outgrow it. People with egg allergies should read labels carefully, since eggs are found in many baked goods, pastas and sauces. Some vaccines and medications may also involve egg proteins, so allergic individuals should inform health professionals.
Eggs around the world
Eggs appear in countless traditional dishes: Spanish tortilla, Japanese tamagoyaki, French quiche, Brazilian ovos mexidos and the famous "PF" plates with fried egg, Chinese egg fried rice and Middle Eastern shakshuka. Their versatility makes them a staple in nearly every cuisine.
Frequently asked questions
How much protein is in an egg?
A large egg has about 6 grams of protein.
Are eggs bad for cholesterol?
For most healthy people, eggs can be part of a balanced diet. People with heart disease, diabetes or high cholesterol should follow their doctor's guidance.
Are brown eggs healthier than white eggs?
No. Shell color depends on the breed of hen.
How long do eggs last in the fridge?
Refrigerated eggs usually stay good for several weeks. Always check the date on the carton.
Is it safe to eat raw eggs?
Raw eggs can carry Salmonella. Use pasteurized eggs for recipes that won't be cooked.
Should I eat the yolk?
Yes, for most people. The yolk contains most of the egg's vitamins, minerals and antioxidants.
Conclusion
Eggs are nutritious, affordable and incredibly versatile. Enjoyed as part of a balanced diet, cooked with healthy methods and handled safely, they can be a practical source of protein and important nutrients for the whole family.