Cashews may be a 'nut' that the Bulletproof Diet heeds warning on, but as long as they are sourced/processed correctly, and if you do not have high sensitivity to them, they can actually be quite healthy - check out this awesome article on the nutritional benefits of cashews: 7 Nutritional Benefits of Cashews Here is more information if you are feeling it. Sensible nutrition ideas, taken to an extreme, forever and always will end up being nonsensical. You can't avoid lectin unless you avoid all plant and animal foods. Two thoughts: avoid the worst offenders (bread, for starters), and make sure your diet has a healthy diversity of plants, especially leafy greens (may I suggest, the humble dandelion and its high in prebiotic fiber greens, delicious fried with onions or garlic or in a smoothie with blueberries). Part of the problem with lectin is not just lectin itself (and consumption of lectins have indeed gone way up compared to ancestral times since the advent of agriculture) but with the lack of diversity in our diet causing a drop in healthy gut cultures (which feed on a variety of prebiotic fiber) which could have dealt with those lectins for us.