Quorn

Quorn is a chicken flavored fungus, discovered in the 1960s in a British dirt sample.

As early as 1977, a study found that some people have adverse reactions to Fusarium venenatum. That unpublished study conducted by Quorn's developer found that 10 percent of 200 test subjects who ate the fungus experienced nausea, vomiting, or other gastrointestinal symptoms, compared with five percent in a control group.