The curious symptoms to me are "stuffing food into their mouths" and a metallic taste. The first almost sounds hallucinogenic - the second can be caused by lots of things. In the early 60's our high school metal shop had a closed and well ventilated area for spraying zinc chromate primer on our projects and we were told never to heat painted surfaces (typically zinc chromate). Acute metal fume fever perhaps? Can be caused by fumes from heated metal or metal dust (magnesium for example) or heated zinc chromate.
Wonder if any toxicology studies have been performed on Airbus new Scalmalloy that makes up the bionic partition between pax and galley as well as the jumpseat (at least on the 320)? Lots of new generation alloys being used in today's environment.