A meta-analysis of 16 randomized trials (Nutrients, 2021): protein source did not affect changes in absolute lean mass or muscle strength. A small advantage for animal protein appeared only in percent lean mass and in adults under 50.

Nutrients · 2021Open accessPMID 33670701

Key facts

Who was studied: Adults in randomized trials comparing animal and plant protein, with or without resistance training
Sample: 16 studies
Main result: Protein source did not affect changes in absolute lean mass or muscle strength; in younger adults (<50 y) animal protein gave greater lean mass gains (WMD 0.41 kg; 95% CI 0.08 to 0.74).
Authors: Lim MT et al.
Full text: PubMed Central (free)DOI 10.3390/nu13020661

Editorial summary by Vegan Guide based on the publication. This is not medical advice.

Study details

Limitations

Variability in subjects and interventions may have masked effects in the pooled estimates.
No data on background diet in supplement trials, so actual animal vs plant protein intake could not be confirmed.

Funding: National University of Singapore (R160-000-A03-133) oraz National University of Singapore Mind Science Centre (R160-000-A62-720)

Conflict of interest: declared