Does Soy Protein Lower Testosterone Levels In Men?

► THE BODY TRANSFORMATION BLUEPRINT Science-based muscle building and fat loss system: ► REALSCIENCE ATHLETICS No B.S, premium quality supplements you can trust: CONNECT WITH ME Blog: Instagram: Facebook: GET YOUR FREE CUSTOM MEAL PLAN TAKE MY ONLINE FITNESS QUIZ -------------------------------------------------------------------------------- References: Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men results of a meta-analysis - Effect of protein source and resistance training on body composition and sex hormones - The effects of soy and whey protein supplementation on acute hormonal reponses to resistance exercise in men - -------------------------------------------------------------------------------- Video Summary: Does Soy Protein Lower Testosterone Levels? Is there any connection between soy protein and testosterone? People are always asking me, "does soy protein increase estrogen and lower testosterone", as this has been a very commonly accepted "truth" in the bodybuilding community for many years. You might be asking this because you're a vegan/vegetarian who regularly consumes things like tofu, tempeh, soybeans, soy milk or soy protein powder, or you're just someone who enjoys including soy in their diet in general. It is true that soy protein contains "phytoestrogens", but these are plant-derived and are different from the estrogen found in the human body. If we actually take a look at the data on soy protein and testosterone, we basically see that soy does not appear to lower testosterone levels in men to any statistically significant degree. The only studies that did show a decrease involved the over-consumption of massive amounts of soy, or the decrease was small/temporary and testosterone levels went back to baseline fairly quickly. In 2010 a meta-analysis was done combining the data from 15 studies and 32 reports examining soy protein and testosterone levels, and the conclusion stated: "neither soy foods nor isoflavone supplements alter measures of bioavailable T concentrations in men." So when it comes to soy protein side effects as they relate to bodybuilding, I don't see it being a cause for concern. However, since there is some data that does demonstrate a dose-dependent connection between soy protein and testosterone, my advice would just be to exercise some basic moderation as it IS possible that consuming large amounts over an extended period might have some negative effects. If you want to be on the safe side then keep it limited to 1-2 standard sized servings of soy protein a day, and cap your soy intake around 25-30 grams. However, for most people this won't be an issue as you should be consuming a variety of protein sources throughout the day anyway especially if you're a vegan. So all in all, the issue of soy protein and bodybuilding really won't even be something worth worrying about for most people.
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