The Claim

In healthy young men aged 18–35 following a supervised 12-week resistance training program and consuming 45 grams of daily protein, a blend of soy and pea plant-based protein produces increases in lean mass, muscle cross-sectional area, and lower-body strength equivalent to those produced by whey animal-based protein.

Source: Similar effects between animal-based and plant-based protein blend as complementary dietary protein on muscle adaptations to resistance training: findings from a randomized clinical trial

What the research says

Supports is higher

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

Supports
68score
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

Among healthy young men doing supervised weight training and consuming 45 grams of protein daily, a combination of soy and pea protein results in the same increases in muscle mass, muscle size, and lower-body strength as whey protein.

See the scientific wording

In healthy young men aged 18–35 following a supervised 12-week resistance training program and consuming 45 grams of daily protein, a blend of soy and pea plant-based protein supports increases in lean mass, muscle cross-sectional area, and lower-body strength to the same extent as whey animal-based protein, suggesting that protein source does not significantly alter muscle adaptations when total protein intake is adequate and amino acid profiles are balanced.

Why this might work

When protein is eaten, leucine enters the bloodstream and turns on a cellular switch in muscle cells that tells them to build more protein. This switch, called mTORC1, increases the production of new muscle proteins. Over time, with regular strength training, this leads to bigger muscle fibers and stronger muscles. The amount of leucine from soy and pea protein is enough to activate this switch just as well as leucine from whey protein, so muscle growth and strength improve equally.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Similar effects between animal-based and plant-based protein blend as complementary dietary protein on muscle adaptations to resistance training: findings from a randomized clinical trial

    In a study where young men lifted weights and drank either plant-based (soy and pea) or whey protein every day, both groups gained the same amount of muscle and strength. So, plant protein works just as well as whey when you get enough of it.

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.