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Soy Protein: As Good As Whey Protein? |
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Written by Anssi Manninen, MHS
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Tuesday, 07 August 2007 |
 Soy protein has a bad reputation in
the athletic community. However, modern Soy protein isolate (e.g., SuproŽ) has
a very high protein content and relatively neutral taste. Furthermore, the
amino acid profile of Soy protein is pretty good. Since there is little, if
any, data regarding the effects of Soy protein on exercise-induced body
composition changes, a recent 12-week study by Doug Kalman and co-workers
compared the effects of different protein sources in combination with a
resistance training program. Twenty subjects were supplemented with 50
grams/day of one of four different protein sources: Soy concentrate, Soy
isolate, Soy isolate-whey blend, or whey only. Simply stated, this study
demonstrated that both Soy and whey protein supplementation results in similar
lean body mass accretion during resistance training. In addition, Soy protein
had no adverse effects on testosterone levels
Kalman D et al. Effect of protein source and
resistance training on body composition and sex hormones. JISSN, 2007, 4:4.
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