Soy hormone myths, meta-analysis A review into a host of studies is seeking to dispell myths surrounding soy and hormone impacts - Media Credit: Adobe. Do not use without permission.

Soy Hormone Myths Clarified Thanks To Leading Meta-Analysis

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2 Minutes Read

Soy has been given a bad name for decades. Myths citing it as being full of hormones, and capable of affecting both estrogen and testosterone have been widely circulated around the globe.

But now, thanks to a leading meta-analysis study, the verdict is in: you shouldn’t fear soy, and here’s why.

How did soy get a bad name?

For more than 30 years, the health effects of soybeans and soy-based foods have been heavily investigated.

One consistent myth has remained. 

And that is that soy-based products contain high levels of estrogen. This has led to some people fearing eating it, and others worrying that it may lower testosterone levels.

Part of this confusion lies in the fact that soy contains a lot of isoflavones, which are a type of phytoestrogen. This is a plant estrogen, and while it has similar effects to humankind, they are much weaker. Many studies looking into soy isoflavones may not even be applicable to human studies, according to Havard T.H. Chan School Of Public Health

‘There are many factors that make it difficult to construct blanket statements about the health effects of soy’, the academics state.

And, ultimately, protein-rich soy is more likely to provide health benefits over anything negative.

Soy hormone myths, meta-analysis
Adobe. Do not use without permission. The legume is high in protein and possesses many health benefits

Hormone ‘disruptor’

The newly published meta-analysis breaks down a host of historical studies into soy to ascertain the truth behind it.

Within it, scientists say soy became labeled as an ‘endocrine disruptor’. 

This means it was classified as an agent that ‘interferes’ with the natural hormones system that produces and secretes hormones in the body. 

Other endocrine disruptors have been linked to increased risks of developing health conditions such as obesity, diabetes, thyroid problems, and heart disease.

People became concerned intake would ‘feminize’ men due to estrogens. Other studies fed this, as they had concluded testosterone levels could decrease with soy consumption.

But these studies contained gaps in their methodology, and they lack credibility, the meta-analysis concludes.

Myths clarified about soy

This technical review examined claims that isoflavones are endocrine disruptors and focused primarily on the clinical data; and secondarily, on observational data. This included research into over 40 clinical studies.

Its key finding was that neither soy-based foods nor isoflavones should be labeled as ‘disruptors’ of the endocrine. The study encourages future research exploring the biological effects.

You can read the full analysis here

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The Author

Emily Baker

Emily is a journalist based in Devon, where she reports on issues affecting local people from politics to the environment. She has also written features on feminism for Polyester Magazine.

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10 months ago

It’s the cowboys, not the soy boys that have man boobs from real pregnant cows milk estrogen ?

Waky II Sr.
Waky II Sr.
10 months ago

The proof is in the pudding. This ‘study’ offers nothing on the long term side effect, but East Asians have been consuming #soybean for centuries, and it’s proven they have have feminine-looking men and smaller male appendages.

Jeffery Holley
Jeffery Holley
8 months ago

The Soy Nutrition Institute funded this. This is marketing not research: “Mark John Messina receives funding from the Soy Nutrition Institute as its Executive Director. Both Mindy Kurzer and John Sievenpiper are on the advisory board of the Soy Nutrition Institute. Ian Rowland is on the advisory board of the European Plant-based Foods Association. I have disclosed those interests fully to Taylor & Francis, and have in place an approved plan for managing any potential conflicts arising from these positions.”

Susanne Floe
5 months ago

I’m still disappointed I don’t have at least a C cup after all that tofu I’ve eaten!!!!!

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