I believe it’s the heavy metals and ingesting too much of any given one at once. Heavy metals are in our food (ESPECIALLY baby food, go figure), water, household items, etc. The drastic increase of vaccines given to young children plus the onslaught of the crap food here in America is what I think caused this autism explosion, they’re already overloaded from the shots, then they’re eating and drinking more than they can filter out…disaster strikes.