I ATE SOY Every Day for 30 Days! Here’s What Actually Happened

30-Day Soy Experiment Overview

The video documents a 30-day experiment where the creator ate soy every day to test common myths about soy’s effects on hormones and health.

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Dietary Changes

• Replaced all plant-based milks with soy milk daily.
• Increased intake of tofu, tempeh, and edamame.
• Maintained protein intake around 140-160g daily.
• Kept calories and training volume consistent (with a slight reduction in training between marathon cycles).
• Avoided soy protein powder.

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Health & Training Context

The creator is a long-distance runner training between marathon cycles. Prior to the experiment, they experienced low energy due to low ferritin (iron binding). During the soy experiment:

• Energy levels normalized.
• No digestive issues or bloating were reported.

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Common Soy Myths Tested

• Soy raises estrogen in men.
• Soy lowers testosterone.
• Soy disrupts thyroid function.
• Soy causes inflammation.

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Blood Work Results

Compared to previous tests from 6-12 months prior, the following changes were observed:

• Total testosterone: Increased (from 929 to 1100+).
• Free testosterone: Increased (from 73 to 83).
• Estrogen (estradiol): Decreased slightly, remaining in a healthy range.
• Thyroid markers (TSH and free T4): Remained stable or improved slightly.
• HDL cholesterol: Increased slightly.
• LDL cholesterol: Increased, attributed to genetics and increased calorie intake.
• Fasting glucose: Unchanged.
• Inflammation marker (HSCRP): Mild increase (from 1 to 1.5), possibly due to tofu consumption or high running mileage.

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Conclusions

Soy does not cause the feared hormonal disruptions in a real-life, normal diet context.

• Phytoestrogens in soy do not meaningfully affect male estrogen or testosterone levels.
• Thyroid function is not negatively impacted by soy intake.
• The fear around soy is largely exaggerated and not supported by this personal experiment.
• Soy is considered a good, normal food choice by the creator.
• Nutrition is not as fragile as some fear-based claims suggest.

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Additional Notes

• The experiment was self-conducted and not a formal scientific study.
• The creator plans to continue consuming soy moderately and may repeat the test after a year.
• Viewers are invited to suggest other foods for similar 30-day tests.

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Sponsor Mention

Zocdoc: A free online service to find and book doctor appointments quickly without phone calls, offering access to over 150,000 providers across the U.S.

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Notable Locations, Products, and Speakers

• Soy products featured: soy milk, tofu, tempeh, edamame.
• The creator is a marathon runner who recently completed the Chicago Marathon and is preparing for the London Marathon.
• Sponsor: Zocdoc (healthcare appointment booking platform).