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At the root of the problem? That sticky wheat protein, gluten. Although the jury is still out on the connections between gluten sensitivity and behavioral or psychological issues, we do know a few facts: People with celiac disease may be at increased risk for developmental delay, learning difficulties, tic disorders, and ADHD.6 Depression and anxiety are often severe in patients with gluten sensitivity.7, 8 This is primarily due to the cytokines that block production of critical brain neurotransmitters like serotonin, which is essential in regulating mood. With the elimination of gluten and often dairy, many patients have been freed from not just their mood disorders but other conditions caused by an overactive immune system, like allergies and arthritis. As many as 45 percent of people with autism spectrum disorders (ASD) have gastrointestinal problems.9 Although not all gastrointestinal symptoms in ASD result from celiac disease, data shows an increased prevalence of celiac in pediatric cases of autism, compared to the general pediatric population. The good news is that we can reverse many of the symptoms of neurological, psychological, and behavioral disorders just by going gluten-free and adding supplements like DHA and probiotics to our diet.
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David Perlmutter (Grain Brain: The Surprising Truth about Wheat, Carbs, and Sugar--Your Brain's Silent Killers)