Gut health protocol
The lectin free diet
Lectins are proteins found in most plants, especially legumes, tubers, and beans. They can bind to the gut lining and resist digestion, and for some people they contribute to inflammation, leaky gut, and insulin or leptin resistance. This guide shows how to lower lectins and what to eat instead.
What are lectins, and do they cause disease?
Lectins are a type of protein present in most plants, especially legumes, tubers, and beans. They can bind to carbohydrate and to human cells such as intestinal cells, and they resist digestive enzymes. The evidence suggests wheat lectin in particular can contribute to conditions such as diabetes, obesity, rheumatoid arthritis, and coeliac disease. After binding to the gut wall, lectins can create cracks in the lining, leading to inflammation and leaky gut. Lectin can also stimulate insulin receptors (insulin resistance) or bind to leptin (leptin resistance and weight gain).
Is there a lectin and histamine link?
Lectin can increase histamine, part of the body’s immune response. Histamine is produced from the amino acid histidine, and vitamin B6 is needed to metabolise it. Normally two enzymes, DAO and HNMT, clear histamine quickly, but when they run low it accumulates, producing allergic responses, bloating, anxiety, headaches, eczema, and asthma. A malfunctioning DAO enzyme is the main cause, influenced by genetics and gut disease. This is why a lectin-free approach often overlaps with a low-histamine one.
How to reduce or remove lectins
Pressure cook
A great way to reduce lectins in certain grains. Rinse and soak grains in 2 to 3 changes of water before pressure cooking.
Peel and deseed
If cucumber, eggplant, or tomatoes are favourites you cannot give up, peel and deseed them.
Ferment
Fermentation reduces lectins in foods such as soy (miso), cucumber (pickles), and kombucha.
As with any major dietary change, check with your practitioner first, since removing lectins can also limit some nutrient-rich foods. Symptoms of a high-lectin load vary widely, from heightened pain, poor sleep, and stiffness to asthma, IBS, headaches, poor focus, or low energy.
Foods to avoid and enjoy
Best run as a long-term lifestyle change. Avoid Enjoy
| Food group | Avoid | Enjoy |
|---|---|---|
| Grains and flours | Brown and wild rice, pasta, quinoa, rye, kamut, oats, wheat, barley, buckwheat, spelt, corn, rice, potato, pastry, cereal, crackers. | Flours from almond, coconut, hazelnut, cassava, green banana, sweet potato, tiger nut, millet, and arrowroot. |
| Fats and oils | Corn, peanut, grape seed, soy, safflower, sunflower, canola, and partially hydrogenated vegetable oils. | Olive, coconut, macadamia, MCT, avocado, sesame seed, walnut, and rice bran oils. |
| Dairy | Dairy in general, A1 cow’s milk, ice cream. | Buffalo butter, ghee, goat yoghurt, goat milk and cheese, organic heavy cream, sour cream, and cream cheese. |
| Meat and eggs | Grain-fed animals. | Chicken, turkey, duck, quail, pork, lamb, bison, venison. |
| Fish and seafood | – | Hawaiian fish, Alaskan salmon, sardines, mussels, lobster, oysters, anchovies, calamari, crab, shrimp. |
| Vegetables | Legumes, peas, sugar snap peas, green beans, chickpeas, soy (tofu, edamame), all beans and sprouts, eggplant, pumpkin, tomatoes, cucumber, zucchini, squash, chilli peppers, capsicum. | Broccoli, brussels sprouts, cauliflower, artichokes, arugula, asparagus, beets, bok choy, cabbage, carrots, celery, chives, collards, kale, leafy greens, leeks, mushrooms, okra, onions, swiss chard, radicchio, kohlrabi, sweet potato, konjac, taro, yucca. |
| Fruits | Melons and goji berries. | Avocado, apples, blackberries, blueberries, cherries, cranberries, lemons, raspberries, strawberries, kiwifruit. |
| Herbs and spices | Chilli flakes, cayenne, paprika, and all chilli peel and seeds. | Fresh leafy herbs, fennel, parsley, basil, mint, fermented hot sauce, and all spices except chilli. |
| Nuts and seeds | Pumpkin seeds, sunflower seeds, chia seeds, peanuts, cashews. | Macadamias, pecans, pistachios, flaxseeds, hemp seeds, hazelnuts, chestnuts. |
| Sweeteners and drinks | Agave, artificial sweetener, refined sugar. Wheatgrass and barley grass drinks, diet drinks, alcohol, soy milk, energy drinks, coffee, juices, soft drink, yerba mate, nettle, black and green tea. | Stevia, yacon syrup, inulin, chicory sugar, xylitol, erythritol. Water, coconut milk, red wine. |
A sample lectin free day
Breakfast
Cereal of cooked millet, shredded coconut, almond milk, macadamia, and berries; or an omelette with garlic, mushroom, and fennel, with spinach.
Snacks
Green smoothie (apple, kiwifruit, kale, mint, lemon), or 1/4 avocado. A coconut-flour paleo wrap with pickled beetroot, endive, parsley, and hemp seed pesto, finished with sesame seeds.
Lunch
Salad bowl with marinated grilled pastured chicken breast, konjac noodles, leek, radicchio, crispy pear, and vinaigrette.
Dinner
Fresh salmon (small amount) or white fish (regular amount) with cauliflower rice, mushrooms, and asparagus.
Adapted for Elemental Health and Nutrition from the Orthoplex and Bio Concepts lectin free diet resource. See also the companion low histamine diet.
Reviewed by Rohan Smith, BHSc Nutritional Medicine · Elemental Health & Nutrition, Adelaide. Last reviewed 13 June 2026.
Important: This summary is general information, not personalised medical advice, diagnosis, or a treatment protocol. Speak with a qualified practitioner about your individual situation. Book a consultation →