The Claim

A total daily protein intake of at least 1.6 g/kg body weight is the primary determinant of muscle hypertrophy during resistance training, and incremental gains in muscle hypertrophy are observed with each additional 0.5 g/kg/day of protein intake.

Source: Defending Science-Based Lifting

What the research says

Supports is higher

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

Supports
67score
Challenges
1score

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
2 studies reviewed
In plain English

If you're lifting weights and want to build muscle, eating at least 1.6 grams of protein per kilogram of your body weight every day is the most important thing — and eating even more protein (like 0.5 extra grams per kg) helps you gain a little more muscle on top of that.

See the scientific wording

Total daily protein intake of at least 1.6 g/kg body weight is the primary determinant of muscle hypertrophy during resistance training, with incremental gains observed per additional 0.5 g/kg/day.

What the research says

2 studies
  1. Study: The effect of protein timing on muscle strength and hypertrophy: a meta-analysis

    This study found that it doesn’t matter when you drink your protein shake — what really matters is how much protein you eat in total each day. More total protein means more muscle growth, which matches the claim.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 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.