Eating Soy and Testosterone: Can Regular Soy Consumption Really Cause Low T?

The debate about men eating soy and its hormonal effects has been going on for years, and there are 2 groups in particular who fuel the debate year after year…

1. The group that often contains a lot of vegans and vegetarians, who claim that soy is in fact, a really healthy superfood, and that there’s no science backing up its testosterone lowering effects.

2. The group that usually contains a lot of bodybuilders and gym rats, who claim that soy is the equivalent of eating birth control pills and that it has very powerful testosterone lowering effects in the human body.

But which group is right? Or could it be that both of them are wrong? Let’s find out:

Eating Soy and Male Testosterone Levels

eating soy and how it affects testosteroneThere is really a need for debate like this, because soy is one of the most consumed foods in the world. It’s literally hidden in almost everything that we stick into our mouths.

Just start reading the labels of foods at your house, and you’ll soon see that almost everything has soy in it. The marinade in your meats often contains soy. See that word “vegetable oil?”, that’s more than likely processed soybean oil. Soya lechitin is a filler agent in most processed foods, and as you might guess, it’s a highly processed end-product of soybean production.

It’s so funny how blind we are to the fact that we’re eating a shitload of soy everyday, without actually eating soy. It’s just hidden in everywhere.

Back in 1999 more than 7% of all dietary fats in America, came from soybeans. Over a quarter of all American baby-formulas are made with soy as the base ingredient. And school lunch programs across the country are even adding soy to hamburger patties. That’s just crazy.

Why is soy put into everything then?

1. About 93% of the soy in the U.S is now officially GMO’d (genetically modified). This means that soy is extremely cheap. And cheap is what most of the food manufacturers like.

2. SOYJOY® is one of the leading sponsors of AND (Academy of Nutrition and Dietetics), which is an agency that pretty much dictates how the Americans should eat. No wonder why the governmental food recommendations state that men should eat at least two servings of soy per day…

Well what about the claim of soy reducing male testosterone levels? What is the basis for that?

Answer: Soy contains these compounds called isoflavones (genistein, daidzein and glycitein) which act as phytoestrogens (plant estrogens) in the human body. They’re structurally similar to the principal female hormone, estrogen, and are believed to have similar effects in the body.

As high estrogen level in men are almost always a direct route to low testosterone levels, eating soy – which contains estrogenic compounds – is often blamed for lowering testosterone.

But is that really what happens in the human body? Let’s see what science says:

a) Dr. Kenneth D.R. Setchell from Colorado State University, discovered this small molecule called equol from humans back in 1982. Since then he has been researching the molecule. He has already proven that the compound is formed in the gut when we eat isoflavones, and that men who eat a lot of soy have high amounts of equol present in their blood stream. Back in 2004, Dr. Setchell found out that equol is a strong anti-androgen, which can almost completely shut down the activity of dihydrotestosterone (the most potent androgen).

b) This study followed one 19 year old man who started consuming hefty amounts of soy in his diet. Suddenly the guy lost all interest to sex and suffered from erectile dysfunction. His blood DHEA, testosterone, and DHT levels also plummeted significantly. 1 year after stopping the soy consumption, his erectile health and hormonal profile was fully regained

c) In this human study, from 99 infertile men, the men that ate the most soy had the lowest sperm count.

d) In this study, soy protein increased the number of epithelial cells in the breast tissue by 29% (this is a sign of overblown estrogen).

h) These three animal studies [this, this, and this] found out that the isoflavones in soy can cause breast cancer (another sign of overblown estrogen).

i) In this study the researchers found out that male infant rats who received soybean feed when they were still in womb, had problems in sexual organ developement. This study also found out similar effects.

j) In this study, soy protein decreased testosterone and DHT levels in healthy young men.

NOTE: There are few studies which show no major differences in testosterone levels after soy consumption. However they’re quite often sponsored by SOYJOY® or other large soy producers. Meaning that the results are of no use and often completely biased.

Another thing to note is that dihydrotestosterone is made when an enzyme called 5-alpha reductase converts testosterone into DHT, and as soy lowers DHT, there is actually less testosterone being converted too. Meaning that the reduction in DHT can mask the testosterone lowering effects.


There really isn’t a reason for why men should be eating soy. It contains powerful phytoestrogens and produces equol in the gut which is a strong anti-androgen.

On top of that, does anyone actually like the taste of soy? The only people who eat it are women and men who follow a vegan/vegetarian diets. For men who don’t follow these diets, we tend to eat soy only by accident, as it’s hidden around in so many of our favorite foods.

Anyhow, you should probably avoid soy if you’re a man. It’s not good for us, and it tastes bad.

If you are looking for a natural supplement to boost your testosterone, I would recommend TESTRO-X. 

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Eating Soy and Testosterone: Can Regular Soy Consumption Really Cause Low T? was last modified: July 13th, 2017 by Ali Kuoppala

Ali Kuoppala

Ali Kuoppala is the founder of Anabolic Men, and an Independent Researcher that has been credited with organizing the findings that have helped thousands of men reach hormonal balance.
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  1. nick on 01/01/2015 at 18:56


  2. John Holifield on 28/01/2015 at 18:39

    A lot of vitamin d supplements contain soy. Beware.

    • Anthony on 14/08/2015 at 18:45

      Exactly! Most (cheap) Vit D supplements also contain other cheap shitty oils.

    • OnTheBayou on 12/04/2017 at 10:14

      Repeat after me: “The dose makes the poison.”

      The tiny amounts of soy found in many supplements is too little to worry about. Worry about the big ones, where grams, ounces, and pounds of this devil food might enter your body.

  3. dudedude7 on 25/02/2015 at 01:35

    Soy bad.

  4. Marcus Jasso on 29/04/2015 at 06:32

    I regularly use cashew milk in my shakes, however once or twice a year I’ll purchase the unsweetened soy milk by Silk and use it with avocados, with a plant based protein… Your thoughts ??

    • OnTheBayou on 12/04/2017 at 10:12

      You need to ask? If so, reread the article.

  5. Tony Rushing on 28/08/2015 at 03:48

    slight confusion, (no pun intended) if rice and soy have t lowering chemicals, then why does China have the largest population on Earth?

    • Green Deane on 13/03/2016 at 00:25

      The majority of people in China — and elsewhere — who have children are young couples. At that age most of the anti-testosterone effects wont’ drop their T to the point of affecting fertility. And Asians eat more fermented soy that westerners which reportedly reduces the estrogenic effects. Prior to World War II unfermented soy was viewed as not fit for human food. During the war they figured out ways to cheaply bleach and deodorize it. Post WWII it was intentionally — and wrongly so — promoted as a cheap health food.

      • MyName on 25/04/2017 at 12:58

        Fermented foods are good for the gut in general. Some do eat them but not only fermented foods. For example, some consume fermented cabbage in sauerkraut and also unfermented cabbage in cole slaw.

    • checkmate1996 on 19/06/2017 at 10:23

      They are probably eating non-GMO, organic SOY. Big difference.

    • Someone1980 on 17/07/2017 at 21:43

      The answer is that Asian women are so hot that even low T is sufficient to be aroused by them.

  6. Green Deane on 12/03/2016 at 23:03

    Girl food. I don’t eat any soy. I also don’t eat any processed food, which makes avoiding soy easy. That said I know a young man… 27 … who started dating a vegetarian. Thus, as young men are wont to do, he traded good sense for sex and began to drink soy milk to keep his squeeze happy …. until his pencil lost its lead. He laid off the soy milk and things perked up. Whether they will come back to normal depends on how much he can avoid HER diet.

  7. Joseph Muhammad on 04/04/2017 at 10:26

    Great article. I would share it on my Facebook page if it did not include the unnecessary and technically incorrect term “shitload.”

  8. Joseph Muhammad on 04/04/2017 at 10:31

    If she wants an unending menstrual cycle, to cry at every thing that happens, and to weigh 800 pounds she should consume soy and coffee. If she wants a normal cycle, normal emotions, and normal weight, she should probably avoid these things unless for some medical reason she is deficient in natural estrogen production.

  9. OnTheBayou on 12/04/2017 at 10:11

    Read of a case where a woman consumed lots of soy. She was masturbating three, four times a day. I’m not making this up, although I can’t point you towards a citation.

  10. OnTheBayou on 12/04/2017 at 10:16

    I had this dietitian friend, not particularly inquisitive, but she knew I was good for an informed opinion on many matters.

    She told me about getting CE (Continuing Education) credits for an online class by, I think, that SOYJOY. I about figuratively screamed, thew some cites at her, looked up that propaganda arm of ADM, et. al.


    • MyName on 19/04/2017 at 02:48

      The meat industry has had their share of propaganda. One was the blaming of the almonds issue. It takes quite a bit of land, feed, and water to care for those enormous animals which are raised for slaughter.
      The sugar industry was also in with the government pushing their brand of poison.
      Soy is given to infants who cannot tolerate animal milk. Doctor’s don’t like lawsuits so that would have stopped long ago if it was a problem, SoyJoy or not.

  11. MyName on 19/04/2017 at 02:44

    People of Asian nations consume quite a bit of soy and the population of those nations isn’t lacking. Many people are lactose intolerant and some are found to have milk allergies in infancy. Soy formula is then given. Doctors don’t like lawsuits so that practice would have stopped long ago if soy was dangerous. Animal milk is from a living creature and a lactating one at that so full or hormonal issues. Be aware of what you eat and introduce new foods slowly so you can see how they personally affect you. Some thrive on soy and some do not. Take a test drive and discover what works for you as an individual.

  12. GeorgeGr on 16/06/2017 at 16:07

    do you think the 0,4% of my protein powder( in a 30gram scoop it s like 200mg soy lecithin) is enough to produce this effects? because i am totally buying orgnanic protein next time but i can t throw away i just bought it .;p i also take care of my macros

  13. SSGSS on 22/06/2017 at 12:06

    What about Clif bars do those have the potential to lower testosterone?

  14. Happy Power on 25/06/2017 at 13:14

    Interesting article

  15. Tomi Pöntynen on 19/07/2017 at 11:03

    I am straight said afraid of totally removing soy from my diet. Some 18 yrs ago I had much overgrown prostate with all possible harmful consequencies . I have since then used soy milk in my oat porridge and some yrs ago my prostate was medically diagnosed to be fully normal size. Regarding sex I do not have problems in spite of my 75 yrs of age. Should I end using soy? I do not feel any symptoms of low T and my muscle growth in gym is OK.

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