I should have really distinguished adhd, spd, and autism, as they are 3 different things, although there can be overlap. I also apologize for my implication that these things are caused entirely by environmental toxins.  I dont believe that, and am not in a position to know very much about it. I do believe that environmental toxins have a huge  and sometimes invisible impact on a person health in general.  My only experience with special needs though,  is with my 6yo who  has sensory imbalances and has been recommended OT. I know anecdotally autistic children who benefitted from diet related  interventions. That doesnt mean to say that their  autism was ''çured''.
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From what ive garnished, some kids with autism, adhd, and  spd, may actually be more sensitive than the general population to environmental toxins and  things like gluten, because of their condition. That is why something like DE could be helpful to them,  in the same way that it is helpful to the general population.
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But, maybe not, maybe it depends on the child. I came to this forum to find out more. Surprisingly, there is little discussion about this anywhere, but some references to  behaviorial improvements in animals brought on my DE
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As for my son, i dont know for sure that his behavioral symptoms are diet related, neurological, inborn, inherited,  or maybe just immaturity.  I mean, i do know that his symptoms are worse if he is tired, underfed, not feeling 100%, because his body has to work harder to deal with sensory input. For that  reason alone, something like DE, which would improve digestion and cleanse the body, and increase vitality, could only be helpful.Â
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Anyway, here are some links about DE and its uses.
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discussion on mdc about using DE for detox
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behavioral disorders and DE
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good summary of uses of DE from killing insects to detoxing humans, and how dangerous it is to inhale
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what does DE remove, and metal toxins in general
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