The Claim

In healthy older men, 14 days of habitual low protein intake (0.7 g/kg/day) increases postprandial plasma availability of dietary amino acids by approximately 5 percentage points compared to high protein intake (1.5 g/kg/day), without altering basal or postprandial muscle protein synthesis rates after a 25 g whey protein meal.

Source: Habituation to low or high protein intake does not modulate basal or postprandial muscle protein synthesis rates: a randomized trial.

What the research says

Supports is higher

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

Supports
66score
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 older men, eating less protein for 14 days raises the amount of amino acids in the blood after a meal by about 5 percentage points compared to eating more protein, but it does not change the rate at which muscle protein is made after consuming whey protein.

See the scientific wording

In healthy older men, 14 days of habitual low protein intake (0.7 g/kg/day) increases postprandial plasma availability of dietary amino acids by approximately 5 percentage points compared to high protein intake (1.5 g/kg/day), without altering basal or postprandial muscle protein synthesis rates after a 25 g whey protein meal, suggesting adaptive changes in amino acid handling do not translate to enhanced muscle anabolism in this population.

Why this might work

When a person eats less protein for two weeks, the liver and muscles reduce how much amino acid they pull out of the blood after a meal, so more amino acids stay in the bloodstream instead of being taken up by tissues.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Habituation to low or high protein intake does not modulate basal or postprandial muscle protein synthesis rates: a randomized trial.

    When older men eat less protein for two weeks, their bodies become better at releasing amino acids from a protein meal into the blood — but their muscles don’t build more protein as a result. The extra amino acids in the blood don’t make muscles grow faster.

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.