Thanks for your reply! But is soy milk a good substitute for milk for a post work-out drink?
no. it makes you into a pussy
correct. also soy doesn't have as-high-quality protein as milk.
Well, maybe. However, it's looking increasingly like the concentrations of isoflavones just isn't high enough in soy to make a measurable, never mind statistically significant difference in hormone levels. You can demonstrate it in rats by feeding them insane amounts of isolated isoflavones though.
Lifted from wikipedia
A 2010 meta analysis of 15 placebo controlled studies showed that neither soy foods nor isoflavone supplements alter measures of bioavailable testosterone concentrations in men [22] Furthermore, Isoflavones supplementation has no effect on sperm concentration, count or motility, and show no changes in testicular or ejaculate volume.[23][24]
22. ^ Hamilton-Reeves JM, Vazquez G, Duval SJ, Phipps WR, Kurzer MS, Messina MJ. (2010). "Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis". Fertil Steril. 94 (3): 997–1007. doi:10.1016/j.fertnstert.2009.04.038. PMID 19524224.
23. ^ Dabrowski, Waldemar M. (2004). Toxins in Food. CRC Press Inc. p. 95. ISBN 978-0-8493-1904-4.
24. ^ Mitchell JH, Cawood E, Kinniburgh D, Provan A, Collins AR, Irvine DS (June 2001). "Effect of a phytoestrogen food supplement on reproductive health in normal males". Clin. Sci. 100 (6): 613–618. doi:10.1042/CS20000212. PMID 11352776.
http://www.clinsci.org/cs/100/0613/cs1000613.htm. Retrieved 2008-12-20.
Also an article by JB for Tnation that covered some of the studies comparing soy supplemtation with whey and casein in elite olympic athletes:
http://www.t-nation.com/free_online_article/sports_body_training_performance_nutrition/soy_whats_the_big_dealI've actually wanted to ask Sean about this.