A meta-analysis of 9 studies with 266 participants (IJSNEM, 2018): with resistance training, soy protein supplements produced the same gains in strength and lean body mass as whey or other animal proteins. One author heads an institute partly funded by the soy industry.

International Journal of Sport Nutrition and Exercise Metabolism · 2018Open accessPMID 29722584

Key facts

Who was studied: People doing resistance training for at least 6 weeks with soy or animal protein supplements
Sample: 9 studies
Main result: No difference between soy and whey protein in strength gains (bench press: χ2 = 0.02, p = .90; squat: χ2 = 0.22, p = .64) or lean body mass (χ2 = 0.00, p = .96).
Authors: Messina M et al.
Full text: PubMed Central (free)DOI 10.1123/ijsnem.2018-0071

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

Study details

Limitations

Studies varied markedly in design (training status, age, sex) and often had very small samples.
For some measures the whey vs soy comparison was limited to only three studies.

Conflict of interest: M. Messina jest dyrektorem wykonawczym Soy Nutrition Institute – organizacji częściowo finansowanej przez branżę sojową (oświadczenie w artykule).