Cooking eggs makes your body able to use almost twice as much of their protein as eating them raw.
Scientific Claim
The digestibility of egg protein is significantly higher when cooked (90.9%) compared to raw (51.3%) in humans, due to structural changes that improve enzymatic access.
Original Statement
“Cooked eggwhite had higher true ileal digestibility (90.9±0.8% versus 51.3±9.8%, P<0.05), higher protein assimilation, slower gastric emptying.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design cannot support claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The claim implies causation ('is significantly higher'), but the study is a small, non-randomized trial in ileostomy patients; the effect may be influenced by gastric motility differences.
More Accurate Statement
“Cooked egg white is associated with significantly higher true ileal digestibility (90.9%) compared to raw egg white (51.3%) in humans with ileostomies, likely due to structural denaturation improving enzymatic access.”
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Randomized Controlled TrialLevel 1bIn EvidenceCausal effect of egg cooking on true ileal digestibility in healthy adults.
Causal effect of egg cooking on true ileal digestibility in healthy adults.
What This Would Prove
Causal effect of egg cooking on true ileal digestibility in healthy adults.
Ideal Study Design
A double-blind, randomized, crossover RCT with 15 healthy adults consuming 25g of egg protein as raw liquid vs. microwave-cooked solid, measuring true ileal digestibility via dual-isotope (L-[1-13C]phenylalanine + L-[15N]tyrosine) tracer method with ileal intubation over 6 hours.
Limitation: Ileal intubation is invasive and not feasible for large populations.
Prospective Cohort StudyLevel 2bAssociation between habitual egg cooking method and protein status in older adults.
Association between habitual egg cooking method and protein status in older adults.
What This Would Prove
Association between habitual egg cooking method and protein status in older adults.
Ideal Study Design
A 1-year cohort study of 200 adults aged 65+ consuming eggs daily in raw (smoothies) vs. cooked (boiled, scrambled) form, measuring serum albumin, lean mass (DXA), and urinary nitrogen balance.
Limitation: Confounding by total protein intake and cooking method variability.
In Vitro Digestion ModelLevel 5In EvidenceMechanistic difference in protease accessibility between raw and cooked egg white.
Mechanistic difference in protease accessibility between raw and cooked egg white.
What This Would Prove
Mechanistic difference in protease accessibility between raw and cooked egg white.
Ideal Study Design
A standardized in vitro digestion model using human gastric and pancreatic enzymes to compare peptide release and free amino acid yield from raw vs. cooked egg white over 2 hours, with SDS-PAGE to visualize protein breakdown patterns.
Limitation: Cannot replicate human gastric motility, mucus layer, or microbial interactions.
Evidence from Studies
Supporting (1)
Protein digestion and absorption: the influence of food processing.
This study says cooking eggs changes their structure in a way that makes it easier for your body to digest the protein, which matches the claim that cooked eggs are much easier to digest than raw ones.