Noradrenergic hyperfunction, as part of the 'fight or flight' response, can lead to panic attacks and delusions. Glutamate has been implicated in the 'Chinese food syndrome', in which food with high amounts of monosodium glutamate interferes with normal neurotransmission causing confusion [39] . For a more complete review of the other neurotransmitter abnormalities that may underlie delirium, the reader is referred elsewhere [40, 41] .