The Claim

In young adult males undergoing a 5-day energy deficit of approximately 30% below maintenance, consuming 0.3 g/kg of essential amino acids (23.5 g) compared to 0.1 g/kg (7.87 g) increases whole-body protein synthesis by 3.4 g/180 min and reduces protein breakdown by 15.6 g/180 min, resulting in a more positive net protein balance, but does not enhance mixed muscle protein synthesis at rest or after resistance exercise.

Source: Effects of high versus standard essential amino acid intakes on whole-body protein turnover and mixed muscle protein synthesis during energy deficit: A randomized, crossover study.

What the research says

Supports is higher

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

Supports
72score
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 young men on a 5-day low-calorie diet, taking a higher dose of essential amino acids (23.5 grams) compared to a lower dose (7.87 grams) increases overall protein synthesis and decreases protein breakdown, leading to a better net protein balance, but does not increase muscle protein synthesis during rest or after weight training.

See the scientific wording

In young adult males undergoing a 5-day energy deficit of approximately 30% below maintenance, consuming 0.3 g/kg of essential amino acids (23.5 g) compared to 0.1 g/kg (7.87 g) significantly increases whole-body protein synthesis by 3.4 g/180 min and reduces protein breakdown by 15.6 g/180 min, resulting in a more positive net protein balance, but does not enhance mixed muscle protein synthesis at rest or after resistance exercise.

Why this might work

When a person eats very little food for several days, giving them a large dose of essential amino acids makes their whole body produce more protein and break down less protein, so they keep more protein overall. This happens because the amino acids in the blood rise high enough to trigger protein-making machinery in tissues and turn off protein-breaking systems, but this does not make muscle tissue make more protein than it would with a smaller dose.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Effects of high versus standard essential amino acid intakes on whole-body protein turnover and mixed muscle protein synthesis during energy deficit: A randomized, crossover study.

    When young men eat less food for 5 days, taking a bigger dose of amino acids helps their whole body make more protein and break down less, so they keep more protein overall — but it doesn’t make their muscles grow any faster than a smaller dose.

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.