The Claim

In healthy adults, consuming egg white protein preloads increases the thermic effect of food by approximately 3–5% compared to isocaloric carbohydrate preloads, and this increase does not translate to measurable differences in overall energy balance over a 5-day period.

Source: A randomized cross-over trial to determine the effect of a protein vs. carbohydrate preload on energy balance in ad libitum settings

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
88score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

In healthy adults, eating egg white protein before a meal causes a small increase in short-term calorie burning compared to eating the same number of calories from carbohydrates, but this does not result in any measurable change in total energy balance over five days.

See the scientific wording

In healthy adults, consuming egg white protein preloads increases the thermic effect of food by approximately 3–5% compared to isocaloric carbohydrate preloads, indicating a higher acute energy expenditure after protein ingestion, but this does not translate to measurable differences in overall energy balance over 5 days.

Why this might work

When egg white protein is eaten, the body breaks down its amino acids and uses more energy to process them than it does for sugar. This extra energy use happens mainly in the liver, where amino acids are stripped of nitrogen and turned into urea, and where new proteins are built. This process burns more calories right after eating, but the body adjusts its hunger and food intake so that total energy used over days stays the same.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: A randomized cross-over trial to determine the effect of a protein vs. carbohydrate preload on energy balance in ad libitum settings

    Eating a protein shake before meals makes your body burn a little more calories right after eating than a sugary shake with the same calories—but over five days, you still eat the same amount and don’t lose weight.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.