Eggs: protein, cholesterol and how many a day make sense

“How many eggs can I have in a day?” has been kicking around gym floors for decades, and the answer has shifted a fair bit. Short version: for most healthy people one or two a day is a non-issue, and three is fine as long as the rest of the plate holds up.

The longer version is more useful, because an egg is not just a protein delivery system. Here is what you actually get per egg, and where people usually get it wrong.

The numbers per realistic portion

A medium egg weighs roughly 55–60 g in the shell, or about 50 g of edible egg. That works out to around:

• 70–80 kcal
• 6–7 g protein
• 5 g fat, about 1.5 g of it saturated
• under 1 g carbohydrate
• 0 g fibre
• roughly 185 mg cholesterol, almost all of it in the yolk

Scaled to 100 g, that is about 145 kcal, 12–13 g protein and 10 g fat. Treat these as rounded averages — they shift with egg size and, far more, with how you cook it. A boiled or poached egg stays put; one fried in a tablespoon of oil carries 40–90 kcal more.

White and yolk are two different foods

Of that 50 g, about 33 g is white and 17 g is yolk. The white gives 3.5–4 g protein for 17 kcal and no fat. The yolk gives 2.5–3 g protein, about 4.5 g fat and 55 kcal — plus practically all of the vitamins and minerals.

The yolk is where you find vitamin B12, vitamin D, vitamin A, riboflavin, selenium, choline (roughly 145 mg per egg) and the eye pigments lutein and zeaxanthin. Bin the yolks and you keep the cheapest part and throw away the interesting one.

Egg protein itself is about as good as it gets: a full spread of essential amino acids and around 0.5 g of leucine per egg, the amino acid that does most of the work in triggering muscle growth.

Fitting eggs into the day

If you are aiming for 25–40 g of protein per meal, two eggs give you roughly 13 g. That is half the job. Eggs make a great base, but they nearly always need a partner.

Dairy and pulses are the obvious ones. A 150 g pot of skyr or Greek yoghurt adds about 15 g of protein for around a hundred calories, while 40 g of hard cheese adds about 10 g but brings fat and salt along with it.

Three combinations with the maths done:

• Breakfast, ~330 kcal, ~34 g protein: three boiled eggs and 150 g of skyr.
• Lunch, ~450 kcal, ~27 g protein: a two-egg omelette with 40 g cheese, 150 g vegetables and a slice of wholemeal bread.
• Slower breakfast, ~550 kcal, ~28 g protein: two eggs alongside 50 g of dry oats cooked in milk.

That last one patches the biggest gap in the egg: there is no fibre in it at all. If breakfast is eggs and nothing else, add vegetables, fruit or a wholegrain.

Who they suit, and who should think twice

Eggs are strong in a deficit. Seventy-eight calories that genuinely fill you up is a good trade, which is why they show up constantly in a cutting plan. That same property works against you when you are trying to gain — eggs are a fine base, but the calories have to come from somewhere else too.

If you do not eat meat, eggs are one of the simplest ways to lift the protein quality of the whole day; the practical side of that is covered in the guide to vegetarian eating for lifters.

Be more careful if you have an egg allergy, a diagnosed lipid disorder, or a doctor who has already told you to watch it. There is also a minority of people whose blood cholesterol responds noticeably to dietary cholesterol — that only shows up in a blood test, never in how you feel.

Common myths

“Cholesterol in eggs goes straight into your blood.” Not one for one. Your liver makes most of your cholesterol and dials production down when more arrives from food. Research generally shows that in healthy people an egg a day is not linked to higher heart disease risk. In people with type 2 diabetes the picture is murkier, and that one is not settled.

“Raw eggs are better absorbed.” The opposite. Cooking pushes protein digestibility from roughly half to over 90 per cent, and it removes the salmonella risk.

“Brown eggs are healthier.” Shell colour comes down to the breed of hen. How the hens are kept and fed does nudge the fat profile, but not dramatically.

“Omega-3 enriched eggs replace oily fish.” They contain somewhat more omega-3, but the amounts are still far below what you get from a portion of salmon or mackerel.

When to see a doctor

Speak to your GP if you have known heart disease, familial hypercholesterolaemia, diabetes, or you are already on medication for blood lipids. In those cases the right number of eggs comes from your test results, not from a general rule. A lipid panel every few years is sensible even if you are well.

A rash, swelling of the lips or throat, nausea or gut trouble after eating eggs needs proper assessment rather than self-diagnosis. And never adjust prescribed medication based on something you read online.

In short

• One egg: about 75 kcal, 6–7 g protein, 5 g fat, 185 mg cholesterol, no fibre.
• Per 100 g: about 145 kcal and 12–13 g protein.
• One or two a day is untroubled territory for healthy adults; three is still fine with a sensible rest of the day.
• The yolk holds the micronutrients — don't bin it out of habit.
• Two eggs is not a protein meal on its own; add dairy, pulses or bread.
• Cooking method changes the calories more than the egg itself ever will.