Nutrition
C · Interpret with cautionSoy protein or animal protein with strength training
Subject: Soy protein versus animal protein
What this means
With strength training, soy protein produced similar gains in strength and lean body mass as whey and other animal proteins. No differences were found between the groups.
Messina M, Lynch H, Dickinson JM, Reed KE · 2018 · International Journal of Sport Nutrition and Exercise Metabolism 28(6):674-685
What does this rating mean?
Limited, mixed or hard-to-translate evidence. Useful as direction, not as a rule.
Findings
No difference between soy protein and animal protein for muscle mass and strength with strength training.
Who this applies to
People who did strength training for at least 6 weeks while taking a protein supplement.
Size of the research
9 studies with a total of 266 participants.
What to keep in mind
Only a few studies were included. In the 5 studies comparing only whey and soy, lean body mass did not clearly increase in either group.
Practical conclusion for REZA
Included with that caveat, as an example of how REZA handles conflicts of interest. The conclusion aligns with the animal-versus-plant-protein study, which carries no comparable interest.
View method and source
Methodology
Systematic review with meta-analysis
Conflict of interest
The first author has known ties to the soy industry. That doesn't automatically make the conclusion wrong, but it is worth noting.
Original source
DOI: 10.1123/ijsnem.2018-0071 · PMID: 29722584
View on PubMed →This information is general education about scientific research. It is not personal medical advice and does not replace diagnosis or treatment by a doctor or other healthcare professional. If you have symptoms, a medical condition or take medication, consult your GP or treating professional before changing your training or nutrition.