Lectins are sticky plant proteins that plants use to defend themselves. Gluten is just one type, and while each lectin's effect seems small, eating them chronically acts like kryptonite, gradually draining your health. Removing them lets your body heal.
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Lectins are basically sticky proteins that exist within these plants that serve the purpose of defending those plants from animals and insects and other predators. So everything in nature is always competing with itself or with one another, and there's kind of a symbiotic relationship. Gluten is only one of many, many, many lectins that have a similar effect on our bodies. Again, little things, any one thing isn't going to do it, but when you're constantly consuming these foods that have those little bit of kryptonite dust in them over an extended period of time, your power, your vitality is diminished. If you remove them, your body can do what it naturally does, which is heal itself and perform at an optimal level and experience an optimal level of health and wellbeing.