Why soy is the perfect plant protein, says doctor


Soy protein is a valuable tool in the health and wellness toolbox, writes one medical doctor.

soy protein

Photo © iStockphoto.com/YinYang

I think we can all agree that one of the best ways to live a healthy life is maintaining a healthy diet and exercising regularly. As a medical doctor, who early in my career chose to focus on understanding nutrition’s impact on our bodies, I am a proponent of a balanced diet that includes healthy plant-based foods—especially soy protein.

Obesity is linked to many potentially lethal health conditions including, heart disease, high blood pressure, and diabetes. As the founding director of UCLA’s Center for Human Nutrition, I have spent decades researching the impact of plant-based proteins—such as soy—on patients versus a meat-based protein diet. Substituting soy protein and other plant proteins for high-fat animal meats can result in better weight control and lower cholesterol and blood pressure levels, although changing one’s diet is not a substitute for seeking medical advice or treatment for these conditions. Reducing extra calories, saturated fat, and cholesterol from meats and substituting soy protein in shakes and foods can help you achieve and maintain a healthy weight, which will also support healthy immune function.

How to Choose the Source of Protein That’s Best for You

With consumers seeking more plant-based proteins and many choices available, including rice, beans, quinoa, pea, soy, and others, it can be tough for consumers to know which plant-based proteins are best for them. The truth is, not all plant-based proteins are created equal.

Unlike the other plant-based proteins, soy is the only one considered a complete protein. Soy contains all 21 amino acids, including the nine essential amino acids that the body cannot make. The essential amino acids can come from the foods we eat. Soybeans are also a good source of fiber, minerals, and complex carbs. Soy protein contains phytonutrients called soy isoflavones, which act as antioxidants, and they feed healthy gut bacteria, making them “prebiotics.” Soy may also benefit the heart. Some studies1 have shown that 25 grams of soy protein a day, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease, although the total scientific evidence is not conclusive.

With So Many Health Benefits, Why Does Soy Sometimes Receive a Bad Rap?

Several years ago, there were reports that soy had a link to breast cancer. However, scientific research has debunked2 this premise, and there is no evidence linking soy consumption to breast cancer. Based on several studies, the American Cancer Society concludes3 there is no harm from eating soy protein or soy foods, and there is mounting evidence that nutrients in soy foods may lower the risk of breast cancer4. Research has also negated5 the myth that soy consumption could cause enlarged breasts in men. In fact, the study showed that soy had no significant effects on men, including any impact on total testosterone levels, another myth about soy.

Now that you understand the joy of soy, there are many ways to add soy to your diet. Foods rich in soy include edamame (whole soybeans), tofu, tempeh, and a convenient, on the go option: a soy protein meal replacement shake. Soy is indeed the perfect protein and an essential addition to a healthy diet. A balanced diet, and lifestyle that includes healthy proteins like soy and regular exercise can help our bodies stay fit and strong.

Dr. David Heber, MD, PhD, FACP, FASN, is the Chairman of the Herbalife Nutrition Institute (HNI), which promotes excellence in nutrition education for the public and scientific community and sponsors scientific symposia. Heber is the Founding Director of the Center for Human Nutrition at the University of California, Los Angeles*, where he has been on the faculty of the UCLA School of Medicine since 1978. He is currently Professor Emeritus of Medicine and Public Health and Founding Chief of the Division of Clinical Nutrition in the Department of Medicine of the David Geffen School of Medicine at UCLA. His main research interests are obesity treatment and nutrition for cancer prevention and treatment. Additionally, Heber directed both the National Cancer Institute-funded clinical nutrition research unit and the National Institutes of Health (NIH) nutrition and obesity training grants at UCLA for over 15 years. For five years, he also directed the NIH-funded UCLA Center for Dietary Supplement Research in Botanicals. He is the former Chair of the Medical Nutrition Council of the American Society for Nutrition, the largest scientific society in nutrition. Heber is a Fellow of the American Society for Nutrition, the highest honor the society confers.* The University of California as a matter of policy does not endorse specific products or services. Heber’s credentials as a professor are for identification purposes only.


  1. Erdman Jr. JW. “AHA science advisory: Soy protein and cardiovascular disease: A statement for healthcare professionals from the Nutrition Committee of the AHA.” Circulation, vol. 102, no. 20 (November 2000): 2555-2559
  2. Collins K. “Soy and cancer: Myths and misconceptions.” American Institute for Cancer Research website. Published February 19, 2019.
  3. Simon S. “Soy and cancer risk: Our expert’s advice.” American Cancer Society website. Published April 29, 2019.
  4. Brody JE. “Shifting the focus of breast cancer to prevention.” The New York Times. Published on November 11, 2019.
  5. Amidor T. “Does eating soy give you man boobs?” Muscle & Fitness. Published October 9, 2018.

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