Doing some research, I found this site :
www.cspinet.org...
It seems as though some people have a severe allergic reaction when eating this stuff.
Quorn is the brand name of meat substitutes that are made from a vat-grown fungus. Some people have dangerous allergic reactions to the fungus and
suffer nausea, vomiting, diarrhea, and occasionally hives or difficulty breathing. Some people react the first time they eat Quorn, while some react
only after building up a sensitivity.

Also, this little nugget of fact.
Quorn is made from a less appetizing fungus (or mold) called
Fusarium venenatum.
and this...
The manufacturer of Quorn is Marlow Foods, a division of the multinational pharmaceutical giant
Astra
Zeneca, one of the dominant corporations in genetically engineered food. They are telling the public that the food is made from mushrooms. The
packaging says the “mycoprotein” in Quorn is “made from natural ingredients” that are “mushroom in origin,” and “made from a small, unassuming member
of the mushroom family.” This evokes images of tiny mushrooms growing humbly and peacefully in the Earth.
more...
This comes as no surprise to Dr. David A. Morowitz, Clinical Professor of Medicine (gastroenterology) at Georgetown University. “ The data argue
compellingly,” he says, “that the mycoprotein derived from Fusarium venenatum is almost certainly gastrotoxic. The risk of its toxicity does not
justify its continued use here in the United States.”
Wow. A food conspiracy.......
[Edited on 3-12-2004 by darklanser]