No Difference Between The Effects Of Supplementing With Soy Protein Versus Animal Protein On Gains In Muscle Mass And Strength In Response To Resistance Exercise
Notes for this study:
||SMD. Versus whey. Soy: 0.39 (-0.15, 0.94 95% CI) Whey: 0.41 (-0.15, 0.98). Versus animal protein. Soy:0.37 (0, 0.73) Animal: 0.43 (0.006, 0.81)
|Number of Subjects
The study was a meta-analysis of randomized, controlled trials investigating the effects of soy protein on lean body mass and strength compared with that of animal protein. Studies were at least 6 weeks in duration, with training at least twice per week.
Funding issues for this study:
9 studies were included in the quantitative analysis. As measured by bench press 1-rep max, strength didn't see a statistically significant difference compared with whey protein controls across 3 such studies, and neither did it for squat/leg press or lean body mass. There were no significant or meaningful differences for all sources of animal protein for these measures either, across 9 studies for lean mass and 6 for each strength measure, respectively.
"M. Messina is the executive director of the Soy Nutrition Institute, an organization that is partially funded by the soy industry."