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The Plant Paradox Review – Are Lectins Dangerous? (Part 1)

By Ritamarie Loscalzo

lectins plant paradox Dr. Gundry

The rumor that lectins are dangerous is getting out of hand. While some people achieve great results by avoiding lectins, for most others, the story is more nuanced than that. Since I am getting a lot of questions about lectins and The Plant Paradox1, in this article, I am critically reviewing the book.

This is part 1 of a 2 part series.

What The Plant Paradox Got Right

Since The Plant Paradox was heavily marketed and appeared on many syndicated TV shows, it got the general public to realize that elimination of certain foods and improving the gut microbiome can heal. This is news to a lot of people who have been subject to the disease care model. For many who struggle with chronic inflammatory issues, avoiding nightshades and high-lectin food can provide remarkable results.

What The Plant Paradox got right:

  • Eliminating sugar, which is inflammatory
  • Increasing foods that are high in antioxidants and fibers
  • Eliminating grains and legumes that can lead to blood sugar disregulation in certain individuals
  • Advocating for high-quality foods, such as organic vegetables and free-range meats
  • Advocating for high-quality monounsaturated fats, such as olive oil and avocados
  • Advising people to avoid toxic hormone disruptors both in foods and the environment

My Plant Paradox Criticism

The Plant Paradox is based on many concepts that have no scientific basis whatsoever. For example, let’s deconstruct the book’s primary claims that “we should avoid lectins because our gut microbiome has not evolved to digest the lectins” and “it takes millions of years for the microbiome to adapt to digest lectins.”

Claim #1 – Our gut bacteria have not evolved to digest lectins.

Basic physiology will tell you that lectins, like most proteins, are digested in the stomach and small intestine by our own enzymes rather than our gut flora. The stomach and small intestine are mostly sterile and have very few bacteria. The beneficial bacteria reside mostly in the large intestine and ferment whatever is left after the digestive process. And while it’s true that some lectins interact with the gut microbiome2, there is no evidence that the gut bacteria digest lectins.

Claim #2 – Gut bacteria take millions of years to adapt.

Dr. Gundry’s argument that “it takes millions of years for the microbiome to adapt” has no scientific basis whatsoever. In 2013, a group at Harvard University published a study in Nature titled “Diet rapidly and reproducibly alters the human gut microbiome.” The authors fed human subjects with different foods and monitored their gut microbiome3. They discovered that it only took 2 – 3 days for the gut bacteria composition to change in its entirety in response to the diet changes.

The Plant Paradox Drives Supplement Sales for Dr. Gundry

These are only two examples of false claims in Plant Paradox. There are also numerous other false statements in the book that could discredit the whole program. Several of his recommendations, while healthy, actually have nothing to do with lectins or the gut microbiome. Much of the book reads like a sensational fear-mongering scheme designed to sell his supplements to the general public.

The Potential Risks of Lectins

For people who are sensitive to lectins, avoiding lectins can really improve their well-being, primarily by reducing inflammation, which can lead to weight loss. However, the healthiest and longest-living populations in the world consume a good amount of the so-called high lectin foods, such as grains and legumes. Also, humans have been consuming lectin-containing foods for as long as we existed, so lectins alone cannot be the root cause of diseases.

Lectins Aren’t The Problem

For those who are sensitive to lectins or any food, it’s not the food’s fault! Modern-day stress, leaky gut, and toxicity cause us to be sensitive to lectins. Individual genetics, biochemistry, and environmental exposure determine the best diet for each of us. Therefore, lectin sensitivity and avoidance is one such factor that needs to be individualized rather than applied to everyone.

What The Plant Paradox Got Wrong

Here are the things The Plant Paradox got wrong:

  • Phase 1 is very similar to the Autoimmune Paleo Protocol, but two weeks is barely long enough to notice major changes in symptoms before other items are introduced.
  • As a therapeutic diet, The Plant Paradox is not restrictive enough for most people with autoimmune diseases because it still includes common food irritants, such as dairy and wine. In other words, it still contains too many food irritants for people who have sensitivities to these foods.
  • Vital Reds and Primal Plants, the polyphenol supplements recommended and sold by Dr. Gundry, contain some substances that may overstimulate the immune system. For people without autoimmune diseases, this product is beneficial. However, people with autoimmune diseases need to be especially careful about immune-stimulating plant substances, especially at supplemental doses.
  • For the general population seeking to get healthy, The Plant Paradox disregards ample evidence which suggests that some high-lectin foods can be healthy. Therefore, the program is unnecessarily restrictive and expensive.
  • While restrictive diets, such as elimination diets and low-FODMAPs diets, can be very therapeutic short-term, staying on such diets long-term can be unhealthy because they lack variety of nutrients.

How to Tell if You Have a Lectin Sensitivity

Could you be sensitive to lectins? The best way to find out is to experiment with a low-lectin elimination diet to see if it makes a difference in how you feel. Working on your gut integrity is also vital to decreasing food sensitivities- whether you have a lectin issue or not.

Check out this list of foods that support gut healing.


  1. Gundry, S. R. The Plant Paradox: The hidden dangers in ‘healthy’ foods that cause disease and weight gain. (Harper Wave, an imprint of HarperCollins Publishers, 2017).
  2. Cordain, L., Toohey, L., Smith, M. J. & Hickey, M. S. Modulation of immune function by dietary lectins in rheumatoid arthritis. Br. J. Nutr. 83, 207–17 (2000).
  3. David, L. A. et al. Diet rapidly and reproducibly alters the human gut microbiome. Nature. 505, 559–563 (2014).

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