Egg white omelet: lean protein, and two small trials where whole eggs did better

In dialysis patients, a meta-analysis of randomized trials found egg white supplements raised serum albumin by 0.42 g/dL (95 percent CI 0.12 to 0.72) across four trials, at very low certainty. Across two trials they cut serum phosphorus by 2.04 mg/dL (95 percent CI 1.58 to 2.50), at low certainty. The authors see no support for routine use in healthy adults. For everyone else the omelet is simply lean protein. The USDA survey record, built from a recipe rather than a lab sample, puts an egg white omelet cooked without fat at 52 calories per 3.5 oz (100 g), with 10.7 g of protein, no fat, no cholesterol and 281 mg of sodium. Made with butter, the same record rises to 97 calories and 5.4 g of fat, and that depends on how much butter the recipe assumes. A 135 g cup of the fat free version works out to about 14 g of protein and 70 calories, recalculated from the 100 g values.

As people eat it, per 3.5 oz (100 g)

How much is actually in it

• An egg white omelet cooked without added fat carries 10.7 g of protein and 52 calories per 3.5 oz (100 g), with no fat and no cholesterol, and 281 mg of sodium. — USDA survey food record for egg white omelet, scrambled, or fried, no added fat (n = 1 record) Evidence E source
  Protein 10.67 g, energy 52 calories, fat 0 g, cholesterol 0 mg, sodium 281 mg per 3.5 oz (100 g)
• Cooking the same egg white omelet in butter raises it from 52 to 97 calories per 3.5 oz (100 g) and adds 5.4 g of fat. — USDA survey food records for egg white omelet made with butter versus no added fat (n = 2 records) Evidence E source
  97 vs 52 calories and 5.36 vs 0 g fat per 3.5 oz (100 g)

What a real portion looks like

• US dietary surveys count an egg white omelet at 33 g per egg white used and 135 g per cup, so a cup gives about 14 g of protein and 70 calories. — FNDDS portion records for egg white omelet, no added fat (n = 3 portion records) Evidence E source
  1 egg white 33 g (3.5 g protein, 17 calories); 1 cup 135 g (14.4 g protein, 70 calories); quantity not specified 66 g

What your body absorbs

• In a tracer study of 10 healthy volunteers, 35.1% of raw egg protein escaped digestion in the small intestine versus 5.7% of cooked egg protein. — Ten healthy volunteers, one cooked and one raw labeled egg protein meal (n = 10) Evidence C source
  5.73% vs 35.10% escaped small intestinal assimilation (P < 0.005)
• Boiled egg white protein had a true ileal digestibility of indispensable amino acids of 86.3%, close to whole boiled egg at 89.4% and cooked meat at 92.0%. — Healthy Indian adults, dual stable isotope tracer method Evidence C source
  86.3% +/- 4.6% egg white vs 89.4% +/- 4.5% whole egg vs 92.0% +/- 2.8% meat

What cooking and storage change

• According to FDA, eggs should be cooked until both yolk and white are firm, and dishes containing eggs to 160 F. — General US consumers Evidence E source
  Cook to firm; egg dishes to 160 F

What it does to your health

• A meta-analysis of 30 RCTs found egg white raised serum albumin by 0.42 g/dL and cut serum phosphorus by 2.04 mg/dL in dialysis patients, with low to very low certainty. — Adults in RCTs of egg derived protein, dialysis subgroups of four and two trials (n = 1938) Evidence A source
  Albumin MD +0.42 g/dL (95% CI 0.12 to 0.72); phosphorus MD -2.04 mg/dL (-2.50 to -1.58)

Safety, limits and interactions

• Egg white is an allergen: in an RCT of 50 egg allergic children, 44% reached the 1 g egg white protein target after 8 months of oral immunotherapy versus 4.8% on avoidance. — Fifty children aged 6 to 17 years with challenge confirmed egg allergy (n = 50) Evidence B source
  Desensitized 22/50 (44%) on OIT vs 1/21 (4.8%) on avoidance at 8 months; 10% discontinued
• According to FDA, children, older adults, pregnant women and people with weakened immune systems are at greater risk of severe illness from egg borne bacteria. — Children, older adults, pregnant women, immunocompromised people Evidence E source
  Higher risk of severe illness
• Egg protein reaches breast milk: in 66 atopic mothers who ate one egg, ovalbumin in milk was higher with gestational diabetes, median 0.87 versus 0.15 ng/mL. — 66 atopic lactating women, milk sampled 2 to 6 h after one egg (n = 66) Evidence C source
  Median 0.87 vs 0.15 ng/mL at 2 weeks (p = .03), GDM n = 6

What people believe that the data does not support

• In a crossover trial of 10 trained young men, whole eggs stimulated more muscle protein synthesis after exercise than egg whites with the same 18 g of protein. — 10 resistance-trained men aged about 21 years, single exercise bout (n = 10) Evidence B source
  Greater myofibrillar protein synthesis with whole eggs (P = 0.04)
• Over 12 weeks of resistance training in 30 young men, whole eggs gave greater improvements in body fat percentage, knee extension and handgrip strength than egg whites. — Thirty resistance-trained young males, 12 weeks (n = 30) Evidence B source
  Greater improvement in body fat percentage, serum testosterone, knee extension and handgrip strength with whole eggs (group x time interaction)

Who this works differently for

• In an RCT of 23 hemodialysis patients, swapping meat or fish for egg white in three meals a week lowered serum phosphate to 4.9 versus 6.6 mg/dL after three months. — 23 hyperphosphatemic patients on chronic hemodialysis, three months (n = 23) Evidence B source
  Serum phosphate 4.9 +/- 1.0 vs 6.6 +/- 0.8 at three months (p < 0.001); no change in albumin or body composition

What is still unknown

• An umbrella review of 13 syntheses on food groups and overweight found no meta-analysis at all for eggs. — 13 systematic reviews and meta-analyses of food group intake and overweight or obesity (n = 13 reviews) Evidence C source
  No meta-analysis found for fish, eggs, white meat and added sugars

The bottom line

Many people choose whites over whole eggs for muscle, and two small trials point the other way. In 10 trained young men after one workout, whole eggs stimulated more muscle protein synthesis than egg whites carrying the same 18 g of protein (P = 0.04). Over 12 weeks of resistance training in 30 young men, the whole egg group improved more in body fat percentage, knee extension and handgrip strength, and the abstract gives no effect sizes. For weight, an umbrella review of 13 syntheses found no meta-analysis on eggs and overweight at all, which is a gap in research and says nothing either way. Cooking is what makes the protein usable. In 10 healthy volunteers given a 25 g labeled egg protein meal, 35.1 percent of raw protein escaped digestion in the small intestine against 5.7 percent of cooked, in a small study without randomization. Boiled egg white reached 86.3 percent true ileal digestibility of essential amino acids, close to whole boiled egg at 89.4 percent and cooked meat at 92.0 percent, measured on freeze-dried white in healthy Indian adults. Who should be careful. Egg white carries the egg allergens. In 50 children aged 6 to 17 with confirmed egg allergy, 8 months of supervised oral immunotherapy desensitized 44 percent against 4.8 percent on avoidance, and 10 percent dropped out, so that is a supervised medical treatment, not a reason for someone with egg allergy to try omelets at home. FDA advises cooking eggs until the white is firm and egg dishes to 160 F, and names children, older adults, pregnant women and people with weakened immune systems as more likely to become seriously ill from bacteria in eggs. On dialysis, egg white can lower phosphate. In an open label trial of 23 hemodialysis patients with high phosphate, egg white in place of meat or fish in three meals a week gave 4.9 against 6.6 mg/dL at three months, with no difference at one month. That belongs in a plan with the dialysis team. Egg protein reaches breast milk. In 66 atopic mothers who ate one egg, milk ovalbumin was higher in the 6 with gestational diabetes, a median of 0.87 against 0.15 ng/mL. We have no data on interactions with medicines.

Sources

1. ewo-r5-01 · USDA FNDDS, dataset
   Egg white omelet, scrambled, or fried, no added fat (FNDDS 32400080, FDC 2707289): Protein 10.67 g; Energy 52 kcal; Total lipid (fat) 0 g; Cholesterol 0 mg; Sodium 281 mg per 100 g
   USDA FNDDS, food code 32400080, FDC 2707289 · checked 2026-10-01
2. ewo-r5-02 · USDA FNDDS, dataset
   Egg white omelet, scrambled, or fried, made with butter (FNDDS 32400070, FDC 2707286): Energy 97 kcal; Total lipid (fat) 5.36 g per 100 g. No added fat (FNDDS 32400080, FDC 2707289): Energy 52 kcal; Total lipid (fat) 0 g per 100 g
   USDA FNDDS, food codes 32400070 and 32400080, FDC 2707286 and 2707289 · checked 2026-10-01
3. ewo-r5-03 · USDA FNDDS, dataset
   Egg white omelet, scrambled, or fried, no added fat (FNDDS 32400080, FDC 2707289): 1 egg white = 33 g; 1 cup = 135 g; Quantity not specified = 66 g
   USDA FNDDS, food code 32400080, FDC 2707289 · checked 2026-10-01
4. ewo-r5-04 · Controlled tracer study
   Ten healthy volunteers were studied once after ingestion of a cooked test meal, consisting of 25 g of (13)C-, (15)N-, and (2)H-labeled egg protein, and once after ingestion of the same but raw meal. Amounts of 5.73% and 35.10% (P < 0.005) of cooked and raw test meal, respectively, escaped digestion and absorption in the small intestine.
   Am J Physiol, 1999 · checked 2026-10-01
5. ewo-r5-05 · Controlled tracer study
   The mean ± SD true ileal IAA digestibility of 2H-labeled egg white protein, whole boiled egg, and cooked meat was 86.3% ± 4.6%, 89.4% ± 4.5%, and 92.0% ± 2.8%, respectively.
   Am J Clin Nutr, 2018 · checked 2026-10-01
6. ewo-r5-11 · Agency guidance
   Cook eggs until both the yolk and the white are firm. Scrambled eggs should not be runny...Casseroles and other dishes containing eggs should be cooked to 160° F.
   FDA, What You Need to Know About Egg Safety · checked 2026-10-01
7. ewo-r5-06 · Meta-analysis of RCTs
   Thirty RCTs (n = 1938) were included. In dialysis patients, egg white supplementation significantly increased serum albumin (MD: +0.42 g/dL [95% CI: 0.12-0.72]; I2 = 82.4%; four RCTs; GRADE: very low) and decreased serum phosphorus (MD: -2.04 mg/dL [-2.50, -1.58]; I2 = 22%; two RCTs; GRADE: low).
   Nutrients, 2026 · checked 2026-10-01
8. ewo-r5-10 · RCT
   Egg allergy is the second most common food allergy in children...After 8 months, 22 of 50 children (44%) on OIT and 1 of 21 (4.8%) on egg avoidance were desensitized to the target dose, 23 of 50 (46%) were partially desensitized (dose <1 g), and 5 of 50 (10%) discontinued.
   J Allergy Clin Immunol Pract, 2021 · checked 2026-10-01
9. ewo-r5-12 · Agency guidance
   Certain people are at greater risk for severe illness and include children, older adults, pregnant women, and people with weakened immune systems
   FDA, What You Need to Know About Egg Safety · checked 2026-10-01
10. ewo-r5-13 · Secondary analysis of RCT
    Breast milk ovalbumin concentrations were measured in 66 atopic women 2-6 h after consumption of one egg at 2, 4, and 6 weeks of lactation...Participants with GDM (n = 6) had higher ovalbumin concentrations at 2 weeks of lactation (median = 0.87 [IQR 0.27-2.17] ng/mL) compared to participants without GDM (n = 60, median = 0.15 [IQR 0.05-0.67] ng/mL; p = .03).
    Pediatr Allergy Immunol, 2026 · checked 2026-10-01
11. ewo-r5-08 · RCT (crossover)
    After exercise, participants consumed intrinsically l-[5,5,5-2H3]leucine-labeled whole eggs (18 g protein, 17 g fat) or egg whites (18 g protein, 0 g fat)...However, whole-egg ingestion increased the postexercise myofibrillar protein synthetic response to a greater extent than did the ingestion of egg whites (P= 0.04).
    Am J Clin Nutr, 2017 · checked 2026-10-01
12. ewo-r5-09 · RCT
    Thirty resistance-trained young males were randomly assigned to one of 2 groups: Whole eggs + RT (WER; n = 15) or egg whites + RT (ERT; n = 15)...There was a significant group × time interaction for body fat percentage, serum testosterone, knee extension, and handgrip strength with greater improvements observed in WER.
    J Strength Cond Res, 2021 · checked 2026-10-01
13. ewo-r5-07 · RCT
    Patients in the intervention group were instructed to replace fish or meat with egg white in three meals a week for three months whereas diet was unchanged in the control group. RESULTS: Serum phosphate concentrations were significantly lower in the intervention group than in controls after three (4.9 ± 1.0 vs 6.6 ± 0.8; p < 0.001) but not after one month of treatment.
    Nutr Metab Cardiovasc Dis, 2019 · checked 2026-10-01
14. ewo-r5-14 · Umbrella review
    No significant results were found for the remaining food groups, and no meta-analysis was found for fish, eggs, white meat, and added sugars.
    Nutrients, 2025 · checked 2026-10-01