Soy... super food or testosterone killer (BLA S4E8)

Soy... super food or testosterone killer (BLA S4E8)

If you follow nutrition influencers on social media then you may have heard someone say that eating soy products can tank you testosterone levels. But is that actually true? in this episode we are going to dive into where this idea came from and if soy actually is bad for your testosterone levels. 

Chapters:

00:00 - Introduction

00:27 - The Origins of the “soy tanks testosterone” idea

02:27 - Soy Overview

05:47 - Mechanism for soy decreasing testosterone

06:30 - Gynecomastia

07:24 - Erectile Dysfunction

08:29 - How quick can hormone levels change with soy?

09:09 - Does soy raise estrogen?

10:27 - Soy and fertility

12:04 - Dosing

12:27 - Meta-Analysis of Soy on hormone levels

13:41 - How do we explain the case studies then?

15:14 - My take

18:06 - Outro

Disclaimer* This podcast is for entertainment, education, and informational purposes only. The topics  discussed should not solely be used to diagnose, treat , or prevent any condition.  The information presented here was created with an evidence based approach, but you please keep in mind that science is always changing and at the time of listening to this there may some new data that makes this information incomplete or inaccurate. Always seek the advice of your personal physician or qualified health care provider for questions regarding any medical condition.

References

Braunstein, G. D., & Klinenberg, J. R. (2008). Environmental Gynecomastia. Endocrine Practice, 14(4), 409–411. https://doi.org/10.4158/EP.14.4.409

Hamilton-Reeves, J. M., Vazquez, G., Duval, S. J., Phipps, W. R., Kurzer, M. S., & Messina, M. J. (2010). Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: Results of a meta-analysis. Fertility and Sterility, 94(3), 997–1007. https://doi.org/10.1016/j.fertnstert.2009.04.038

Martinez, J., & Lewi, J. E. (2008). An Unusual Case of Gynecomastia Associated with Soy Product Consumption. Endocrine Practice, 14(4), 415–418. https://doi.org/10.4158/EP.14.4.415

Messina, M. (2010). Soybean isoflavone exposure does not have feminizing effects on men: A critical examination of the clinical evidence. Fertility and Sterility, 93(7), 2095–2104. https://doi.org/10.1016/j.fertnstert.2010.03.002

Messina, M., Duncan, A., Messina, V., Lynch, H., Kiel, J., & Erdman, J. W. (2022a). The health effects of soy: A reference guide for health professionals. Frontiers in Nutrition, 9, 970364. https://doi.org/10.3389/fnut.2022.970364

Messina, M., Duncan, A., Messina, V., Lynch, H., Kiel, J., & Erdman, J. W. (2022b). The health effects of soy: A reference guide for health professionals. Frontiers in Nutrition, 9, 970364. https://doi.org/10.3389/fnut.2022.970364

Reed, K. E., Camargo, J., Hamilton-Reeves, J., Kurzer, M., & Messina, M. (2021). Neither soy nor isoflavone intake affects male reproductive hormones: An expanded and updated meta-analysis of clinical studies. Reproductive Toxicology, 100, 60–67. https://doi.org/10.1016/j.reprotox.2020.12.019

Sathyapalan, T., Rigby, A. S., Bhasin, S., Thatcher, N. J., Kilpatrick, E. S., & Atkin, S. L. (2017). Effect of Soy in Men With Type 2 Diabetes Mellitus and Subclinical Hypogonadism: A Randomized Controlled Study. The Journal of Clinical Endocrinology & Metabolism, 102(2), 425–433. https://doi.org/10.1210/jc.2016-2875

Su, Y., Tian, Z., Qi, X., Luo, D., Liu, L., Liu, S., Zheng, D., Wei, F., He, Z., & Guan, Q. (2021). Effects of increasing intake of soybean oil on synthesis of testosterone in Leydig cells. Nutrition & Metabolism, 18(1), 53. https://doi.org/10.1186/s12986-021-00580-1