"About one in 140,000 consumers are sensitive to mycoproteins.The Center for Science in the Public Interest claims this may result in "vomiting, nausea, diarrhea, hives and potentially fatal anaphylactic reactions." For comparison, per 140,000 people approximately 70 have allergic reactions to peanuts according to data from the National Health Service of the United Kingdom."
"The fungus is grown in vats using glucose syrup as food. A fermentation vat is filled with the growth medium, and then inoculated with the fungal spores. The Fusarium venenatum culture respires aerobically, so for it to grow at an optimum rate, it is supplied with oxygen, and carbon dioxide is drawn from the vat. To make protein, nitrogen (in the form of ammonia) is added, and vitamins and minerals are needed to support growth. The vat is kept at a constant temperature, also optimized for growth; the fungus can double its mass every five hours.
When the desired amount of mycoprotein has been created, the growth medium is drawn off from a tap at the bottom of the fermenter. The mycoprotein is separated and purified. It is a pale yellow solid with a faint taste of mushrooms. Different flavours and tastes can be added to the mycoprotein to add variety."
see
https://en.wikipedia.org/wiki/Mycoprotein
Not exactly raw food!