Dr Kiel quickly reviews the Mythbuster: Does Soy Decrease Testosterone? The short answer is the evidence is not clear. Read or watch to learn more.

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This playlist covers things like testosterone and other androgens, DHEA (Dehydroepiandrosterone), insulin like growth factor (igf-1, igf 1), and human growth hormone (hgh). The emphasis is understanding these hormones and ways to promote them naturally.

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Hey folks, Dr Kiel here, and I want to take a few minutes to talk about the relationship between soy consumption and male androgen levels. This debate is decades old and there are strong advocates for and against soy decreasing testosterone, so I wanted to address this from an unbiased, evidence-based perspective. A quick google search of this reveals a lot of ‘experts’, some of who have likely done their due diligence and are unbiased, and others who just want to be experts or who have an ulterior motive. I have no dog in this fight, so I’ll do my best to just present the facts and the conclusions that I draw from them.

The scientific or theoretical bases for this concern is as follows. Soy and soy-derived products contain isoflavones, a biological molecule that mimics estrogen and is often termed phytoestrogens. These so-called phytoestrogens may exert adverse effects on male androgens levels. Regardless of whether this occurs biologically, the question is does soy have any clinical or measurable impact on serum testosterone, free testosterone, sex hormone binding globuline (SHBG) or free androgen index (FAI)?

One thing I want to address before I get started is that I am not going to address other potential benefits of soy. It may have many other nutritional benefits, but in an effort to remain focused, I will only discuss soy and its relationship with testosterone. Also, there are dozens of articles and publications on the subject, so I will try to focus on just a few that I find most relevant.

Protein metabolism is complicated but important! Proteins contain amino acids and may be referred to as amino acid chain, branched chain amino acids, peptide, and polypeptides. Sources of protein include whey protein, brown rice, eggs and egg white, protein bars, protein shakes, milk, and many more. You may also hear of c reactive protein, creatine, casein and those are discussed elsewhere. You should understand protein synthesis, protein break down, proteolysis, catabolism versus anabolism, protein building, fasting, fed, starvation, building muscle, skeletal muscle, macronutrients or macromolecules, overall nutrition, and metabolism.

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