As the prevalence of ASD has increased in the <br>world, it is essential to understand that what <br>factors are contributing in the diet and environment <br>regarding ASD. ASD is likely to start before or <br>after birth affecting the immune system and brain <br>development. The environmental pollution is <br>responsible for alterations in brain growth, as <br>described in reports using thalidomide, valproic <br>acid, and viral infection, in addition to some <br>maternal and paternal factors.13<br>In early fetal growth, brain injury is caused by <br>the exposure to various chemicals, poisonous waste <br>locations, air contaminants and heavy metals.45<br>Several toxic compounds are reported to be <br>responsible for medical neurotoxic effects in adults. <br>The effects of such chemical compounds in the <br>growing human brain are unknown and its effects <br>are not known in children.45
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