The Soy Deception

by Dr. David Brownstein, M.D. and Sheryl Shenefelt, C.N.

The Soy Deception exposes the half-truths and deceptive advertising that is used to promote soy as a healthy food. This book provides new information about how the ingestion of soy can cause:
  • Allergies
  • Cancer
  • Graves’ Disease
  • Hashimoto’s Disease
  • Hypothyroidism
  • And Much More!

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Television Interview with Sheryl on Bloomfield Cable TV

Radio Interview with the Authors of The Soy Deception 

About The Book

The soy industry and the media would have you believe that soy is a miracle food and that ingesting soy can help you overcome illness as well as enable you to obtain your optimal health.    However, the most widely available forms of soy (non-fermented soy) are not healthy for you!  This book is meant to help educate consumers, to shed some light on this “not-so-miracle” food, and to make everyone aware of the soy deception. 

Soy is in many packaged foods, flours, dressings, and sauces, as well as hidden in items we would not think to check, such as vitamins or shampoo.  As a health conscious consumer, it is important to be fully informed.  Use this book to help you start asking the right questions about the soy industry and its proclamations about soy.  This will enable you to make an educated decision on whether to include soy in your diet.


Read this book to understand why you should avoid soy in your diet and find out which forms of soy are the most dangerous.  Includes Recipes!

Soy Deception: Table of Contents

Preface (P. 11)

Chapter 1:     About Soy (P. 15)

Chapter 2:     Fermented Versus Non-Fermented Soy (P. 31)

Chapter 3:     Why Avoid Soy? (P. 47)

Chapter 4:     Soy and Phytoestrogens (P. 61)

Chapter 5:     Soy and the Thyroid (P. 73)

Chapter 6:     Soy Formula (P. 87)

Chapter 7:     Soy and Allergies (P. 101)         

Chapter 8:     Soy and Genetically Modified Foods (P. 113)

Chapter 9:     Tips and Recipes (P. 125)

Appendix A:  Soy Descriptions (P. 161)

Appendix B:  Soy-Free Start-Up Shopping Guide (P. 171)

Appendix C:  Soy-Free Restaurant Guide (P. 175)

About the Authors (P. 179)

“My experience has clearly shown that, compared to patients who do not ingest soy, those patients that ingest the most soy have more thyroid problems and more severe imbalances in their hormonal systems.  In fact, I have found it nearly impossible to balance the thyroid and the rest of the endocrine system in those patients who ingest large amounts of soy in their diet.”
– David Brownstein, M.D.

“Soy is a very cheap crop to grow and it has found its way into countless food items and dairy products, not to mention cosmetics, shampoos, and vitamins.  Therefore, many people are exposed to soy on a daily basis without even knowing it!”
-Sheryl Shenefelt, C.N.

Why Avoid Soy?

There are many concerns with soy; it contains many anti-nutrients and components that are toxic to humans.  The ingestion of soy has also been linked to the development of many health issues such as breast cancer, digestive issues, hypothyroidism, infertility, thyroid cancer, and many other disorders as listed in our book on page 58.

There are many potential problems with soy discussed in the book including:

  1. Soy causes many thyroid problems.  It is a known goitrogen—it promotes goiter or swelling of the thyroid gland.  (More about this in Chapter 5.)
  2. Soy inhibits the uptake of iodine, which is used by the thyroid gland in the production of thyroid hormones.  (More about this in Chapter 5.)
  3. Soy contains phytoestrogens (plant estrogens) which may disrupt endocrine function.  (More about this in Chapter 4.)
  4. Soy contains large amounts of phytates (including phytic acid).  Phytic acid is the storage form of phosphate in plants.    Research has shown that phytic acid has been found to reduce the assimilation of minerals including calcium, copper, iron, magnesium, and zinc.  The fermentation process helps in neutralizing phytic acid, which is one reason why fermented soy is healthier for you.  (More about this in Chapter 3.)
  5. Soy has also been shown to increase the body’s requirement for vitamin D.
  6. It has long been recognized that soy consumption can cause vitamin B12 deficiency.
  7. During the processing of soy, highly carcinogenic nitrates and a toxin called lysinoalanine are formed.  Also, many soy foods often contain MSG and aluminum.
  8. Most soy in the United States is genetically modified (GM).  It is estimated that about half of the American soybean crop planted in 1999 carries a gene that makes it resistant to an herbicide (Roundup®) used to control weeds.  Therefore, these GM soy plants are continually sprayed with large amounts of Roundup®.  (More about GM soy can be found in Chapter 8.)
  9. Soy has one of the highest percentages of pesticide contamination of any food.
  10. Soy is highly allergenic and is in fact one of the top eight food allergens.  It is found as filler in so many foods that people with allergies may be at risk.  (More about soy and allergies can be found in Chapter 7.)
  11. Soy contains saponins which have been show to damage the mucosal lining of the intestine or cause leaky gut.  (More about leaky gut can be found in Chapter 7.)
  12. Soy contains oxalates which can prevent calcium absorption and have been linked to the development of kidney stones.