03/11/2026
Great information on Soy for those who’ve been asking….for years. I usually test people to make sure there’s no sensitivity, but otherwise agree it is a great source of protein, especially for those trying to eat more plant based. And as with all foods, stay away from highly processed sources.
The most misunderstood food in nutrition you should be eating.
Misinformation unfortunately plagues the online world.
Everyone seems to have something to say about health and wellness.
Nutrition is probably the area most affected.
We all eat. We all have personal experience with food.
Because of that, many people feel qualified to speak with authority on nutrition, even when the science says otherwise.
As a result, many nutrition myths continue to circulate online long after evidence has disproven them. Once a narrative takes hold on the internet, it spreads quickly and becomes very difficult to reverse.
Soy foods are a perfect example.
The other day I posted about soy being a healthy food.
The reaction in the comments section reminded me how much confusion still surrounds this topic.
Few foods have generated as much misunderstanding as soy, even though soy is simply a legume. It belongs in the same family as beans, chickpeas, and lentils. It’s not a hormone. It’s not a pharmaceutical.
It’s literally a bean.
Yet it has somehow become one of the most misunderstood foods in modern nutrition.
Nutritionally, soy is quite remarkable.
It is a complete protein, meaning it contains all essential amino acids in sufficient quantities to meet daily requirements.
It also provides fiber, protein, calcium, iron, and omega-3 fatty acids.
For centuries it has been part of traditional dietary patterns associated with longevity and good health.
Much of the controversy surrounding soy traces back to high dose isoflavone experiments conducted in rodents decades ago.
Those findings were widely extrapolated beyond their original context and amplified through media coverage and online discussions.
Over time, these early hypotheses became embedded in public perception, even as human evidence began to tell a very different story.
Today the human data are remarkably consistent.
Soy consumption is associated with reduced cardiovascular risk, lower overall mortality, and improved cancer outcomes, without adverse hormonal effects in humans.
When one of my followers recently shared my post about soy foods, the comment section quickly became heated.
One person (not a doctor, not nutritionist, not a dietitian) even wrote that I had lost all credibility by posting about soy.
I actually find it quite sad to see how much misinformation still surrounds these foods.
The scientific literature paints a very different picture.
Clinical trials and meta analyses consistently show that soy protein lowers LDL cholesterol and reduces risk of coronary heart disease.
Large prospective cohort studies also show that soy does not increase breast cancer recurrence or mortality. In fact, several studies suggest the opposite.
Higher soy intake has been associated with lower recurrence rates and lower overall mortality among breast cancer survivors. These associations have been observed regardless of estrogen receptor status and even among women taking tamoxifen.
Concerns about phytoestrogens are understandable, but they are often misunderstood.
Soy contains compounds called isoflavones. These molecules are classified as phytoestrogens because they can bind to estrogen receptors.
However, they do not behave like human estrogen. Instead, they function as selective estrogen receptor modulators, often abbreviated as SERMs. Their biological effects depend on the tissue and the surrounding hormonal environment.
Yes, nutrition science is complex and I don’t blame you for feeling confused.
Large reviews that have examined hundreds of studies have found zero adverse effects on estrogen levels, breast tissue, or endometrial tissue in women.
They have also not found negative effects on testosterone levels or s***m parameters in men.
Despite this, the myth persists that soy will feminize men or lead to gynecomastia, also called “man boobs”.
Weirdly, men who eat westernized diets are actually the ones who are at much higher risk of having gynecomastia. Funny how no one talks about that though.
In practical terms, whole soy foods such as tofu, tempeh, edamame, and soy milk can easily fit into a healthy dietary pattern.
They are nutrient dense, versatile, and affordable. They provide high quality protein without the saturated fat and heme iron commonly found in many animal proteins.
The persistence of soy myths illustrates a broader issue in nutrition science.
Early hypotheses often linger long after the evidence has evolved.
Once a simple narrative spreads online, it becomes surprisingly resistant to correction.
But when we focus on the totality of human evidence rather than animal models or isolated compounds, the conclusion becomes quite clear.
Soy is not a threat.
It is one of the most studied foods in nutrition science.
And when consumed as whole foods within a balanced dietary pattern, it fits comfortably among the foods that support long term health.
People who continue to demonize soy foods online are often relying on outdated or misinterpreted information rather than current evidence.
💚 Dr. Jules
If you wish to see the data, I’ve attached it below.
If you don’t change your mind after reading it, then I’m afraid I can’t help you and you may want to get your nutrition information from someone else.
1.
Soy Isoflavone Intake and Risk of Cardiovascular Disease in Adults: A Systematic Review and Dose-Response Meta-Analysis of Prospective Cohort Studies.
Critical Reviews in Food Science and Nutrition. 2024. Naghshi S, Tutunchi H, Yousefi M, et al.
2.
Soy, Soy Isoflavones, and Protein Intake in Relation to Mortality From All Causes, Cancers, and Cardiovascular Diseases: A Systematic Review and Dose-Response Meta-Analysis of Prospective Cohort Studies.
Journal of the Academy of Nutrition and Dietetics. 2019. Nachvak SM, Moradi S, Anjom-Shoae J, et al.
3.
Neither Soyfoods Nor Isoflavones Warrant Classification as Endocrine Disruptors: A Technical Review of the Observational and Clinical Data.
Critical Reviews in Food Science and Nutrition. 2021. Messina M, Mejia SB, Cassidy A, et al.
4.
Herbal Medications in Cardiovascular Medicine.
Journal of the American College of Cardiology. 2017. Liperoti R, Vetrano DL, Bernabei R, Onder G.
5.
A Meta-Analysis of 46 Studies Identified by the FDA Demonstrates That Soy Protein Decreases Circulating LDL and Total Cholesterol Concentrations in Adults.
The Journal of Nutrition. 2019. Blanco Mejia S, Messina M, Li SS, et al.
6.
Soy Protein, Isoflavones, and Cardiovascular Health: An American Heart Association Science Advisory for Professionals From the Nutrition Committee.
Circulation. 2006. Sacks FM, Lichtenstein A, Van Horn L, et al.Guideline
7.
Survivorship.
National Comprehensive Cancer Network. Updated 2026-02-02.
8.
American Cancer Society Nutrition and Physical Activity Guideline for Cancer Survivors.
CA: A Cancer Journal for Clinicians. 2022. Rock CL, Thomson CA, Sullivan KR, et al.Guideline
9.
Soy Food Intake After Diagnosis of Breast Cancer and Survival: An in-Depth Analysis of Combined Evidence From Cohort Studies of US and Chinese Women.
The American Journal of Clinical Nutrition. 2012. Nechuta SJ, Caan BJ, Chen WY, et al.
10.
Soy, Red Clover, and Isoflavones and Breast Cancer: A Systematic Review.
PloS One. 2013. Fritz H, Seely D, Flower G, et al.
11.
Soy Food Intake and Breast Cancer Survival.
The Journal of the American Medical Association. 2009. Shu XO, Zheng Y, Cai H, et al.
12.
Phytoestrogens and Breast Cancer: Should French Recommendations Evolve?.
Cancers. 2022. Mauny A, Faure S, Derbré S.
13.
Effects of Soy Protein and Isoflavones on Circulating Hormone Concentrations in Pre- And Post-Menopausal Women: A Systematic Review and Meta-Analysis.
Human Reproduction Update. 2009. Hooper L, Ryder JJ, Kurzer MS, et al.
14.
Effect of Soy Isoflavones on Measures of Estrogenicity: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
Advances in Nutrition. 2024. Viscardi G, Back S, Ahmed A, et al.
15.
Soy Foods, Isoflavones, and the Health of Postmenopausal Women.
The American Journal of Clinical Nutrition. 2014. Messina M.
16.
Use of Plant-Based Therapies and Menopausal Symptoms: A Systematic Review and Meta-analysis.
The Journal of the American Medical Association. 2016. Franco OH, Chowdhury R, Troup J, et al.
17.
Trending Cardiovascular Nutrition Controversies.
Journal of the American College of Cardiology. 2017. Freeman AM, Morris PB, Barnard N, et al.
18.
American Cancer Society Guideline for Diet and Physical Activity for Cancer Prevention.
CA: A Cancer Journal for Clinicians. 2020. Rock CL, Thomson C, Gansler T, et al.Guideline
19.
Soy and Isoflavone Consumption and Multiple Health Outcomes: Umbrella Review of Systematic Reviews and Meta-Analyses of Observational Studies and Randomized Trials in Humans.
Molecular Nutrition & Food Research. 2020. Li N, Wu X, Zhuang W, et al.