At Switch4Good, we advocate for switching away from dairy and instead having plant-based milks for a variety of reasons, including ethical, environmental, and health. And fortunately, they are gaining popularity and options such as almond, oat, soy, and pea now occupy prime grocery store real estate. However, some consumers have expressed concerns about whether lectins in plant milks are problematic. But first let’s answer: what are lectins, and do they pose a real health risk? Keep reading to break down the evidence and answer your biggest questions.
What Are Lectins?
Lectins are a group of carbohydrate-binding proteins naturally found in many plant foods, such as legumes, whole grains, and some fruits and vegetables. Plants produce lectins as a defense mechanism against pests and pathogens, but these proteins can interact with human cells (particularly in the gut) leading some to question whether they could be harmful.
There are many types of lectins, and their health effects can vary greatly depending on their structure and concentration. Some lectins, such as ricin (from castor bean seeds and not consumed by humans), are highly toxic, while others are benign, and others are even potentially beneficial in small amounts.(1)
Potential Effects of Lectins on the Body
Lectins can bind to cell membranes and interfere with nutrient absorption, and certain types may damage the intestinal lining when consumed in large amounts in raw or improperly cooked foods. This is most relevant for raw kidney beans, which contain phytohemagglutinin—a lectin that can cause acute gastrointestinal symptoms.(2) However, when was the last time you ate raw kidney beans? Boiling beans for at least 10 minutes deactivates the lectins, removing the risk to your health.
For individuals with sensitive gastrointestinal systems or autoimmune conditions, certain lectins may theoretically exacerbate symptoms. However, evidence supporting this in humans is limited and largely anecdotal.(3) We’ll further discuss what could be causing your issues.
How Prevalent Are Lectins in Plant-Based Milks (and Cow’s Milk)?
Most commercial plant-based milks undergo multiple processing steps—soaking, heating, enzymatic treatment, and filtration—all of which significantly reduce lectin content. Cooking and high-heat processing are well known to denature lectins (like we see with beans).(4)
- Soy milk: Soybeans are high in lectins when raw, but soy milk is made from cooked soybeans or soy protein isolate, which contains very low lectin levels. The same goes for edamame and tofu.
- Oat milk: Oats contain lower lectin levels than legumes, and heat processing during oat milk production reduces them further.
- Almond and other nut milks: Lectin content in almonds is relatively low, and again, processing diminishes this.
- Coconut milk: Coconuts contain the lowest lectins, so a coconut milk made from only coconuts will be nearly lectin-free.
- Pea protein milk: While peas contain lectins, isolated pea protein used in milks is purified and treated, minimizing active lectin content.
- Cow’s milk: Lectins are not found in cow’s milk. However, we know dairy can cause many other health problems including gastrointestinal distress. The effects of lectins, even among those who are very sensitive, tend to be more mild than the consequences of lactose intolerance.
Could Plant-Based Milks Cause Lectin-Related Symptoms?
While some individuals report bloating, gas, or digestive discomfort after consuming plant-based milks, attributing this to lectins may be an oversimplification. There are several possible explanations for such symptoms:
- FODMAPs: Oat milk and soy milk can contain fermentable carbohydrates that cause bloating in sensitive individuals, especially those with irritable bowel syndrome (IBS).
- Additives: Many plant milks contain thickeners, emulsifiers (like carrageenan or gums), or sweeteners, which can irritate the gut in some people who are sensitive.
- Individual Sensitivities: Personal intolerances or gut dysbiosis can lead to a variety of symptoms unrelated to lectins.
It’s not fair to blame lectins when there are many reasons a food can bother a person. Working with a healthcare provider that specializes in gastrointestinal conditions is the best option to understand your root cause and make appropriate dietary changes.
Who Should Be Cautious About Lectins?
For the general population, lectins in plant-based milks are unlikely to pose a health risk or uncomfortable side effects. However, certain groups with diagnosed medical conditions may want to be more discerning:
- Individuals with autoimmune diseases (e.g., rheumatoid arthritis, lupus)
- Those with severe IBS or IBD (e.g., Crohn’s disease, ulcerative colitis)
It’s also important to note that folks that fall into these categories should be more critical of their diets in general, as certain foods may trigger symptoms. Not everyone will react to lectins, and an individualized approach should be taken to determine what foods are appropriate or should be avoided.
How to Choose a Plant-Based Milk If You’re Sensitive to Lectins
If you suspect lectins might be contributing to symptoms, and you’ve ruled out other root causes, here are some tips for choosing a plant-based milk:
- Look for options made from lower-lectin ingredients: Coconut, rice, and almond milks tend to be lower in lectins compared to soy or pea-based milks.
- Check for minimal ingredients: Choose products with fewer additives, especially emulsifiers like carrageenan or gums that may independently affect gut health.
- Consider homemade versions: Making your own almond or rice milk allows you to soak and cook the ingredients yourself, which further reduces lectins. Keep in mind these options are not fortified with essential nutrients like calcium and vitamin D.
Conclusion: Focus on the Bigger Picture
While lectins have been vilified in some diet circles, the reality is that they are mostly inactivated through proper food processing and preparation. Commercial plant-based milks are generally safe, even for those with gut sensitivities. If you’re experiencing symptoms, consider other factors before blaming lectins. Working with a registered dietitian or healthcare provider to identify triggers and build a personalized nutrition plan is always the best approach.
Check out our dairy-free recipes to get started in the kitchen, including these lower-lectin options:
