>>Very often there are other children in the household, living with the same biological parents, eating the same diet, going to the same schools, and behaving normally. <<
It’s a chemical imbalance treated by Serotonin reuptake inhibitors.
People can “say” it’s imaginary or that this is easily treated with a change of diet, but until you’ve lived with someone who is manic, you will never know.
This is not playtime. When your fourteen year old, who is bigger than you, agitated and breaking furniture, laughing with glee, something needs to be done and experimenting with diet isn’t it.