Harmful side effects of mycoprotein

Written by kathryn pless
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Harmful side effects of mycoprotein
Mycoprotein is used in Quorn products as a meat subsitute. (Image by Flickr.com, courtesy of robbie jim)

Mycoprotein is used in foods produced by the Quorn company. Quorn offers many vegetarian entrées and foods that use mycoprotein as a meat substitute.. It is derived from the fungus fusarium venenatum. Most people can tolerate mycoprotein, but some people experience unwanted and potentially harmful side effects from this protein source.

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Digestive Side Effects

The Center for Science in the Public Interest reports that some people may experience vomiting, nausea and diarrhoea from consuming mycoprotein.

Allergic Reactions

The CSPI also states that hives, although rare, may occur from consuming foods containing mycoprotein.

Anaphylactic Reactions

The CSPI warns that potentially fatal anaphylactic reactions may occur in people severely allergic to mycoprotein. Signs of an anaphylactic reaction include swelling of the tongue and throat, and difficulty breathing.


While most people can tolerate mycoprotein, those who suffer from coeliac disease, have a sensitivity to gluten or are lactose intolerant should avoid mycoprotein. According to Mycoprotein.org, myocprotein contains gluten and a small level of lactose. Side effects may include bloating, diarrhoea, and stomach pain.


The governments of Great Britain and the U.S. have not found it necessary to require a warning about possible allergic reactions to mycoprotein to be placed on the labels of food containing this ingredient. Also, restaurants are not required to inform their patrons that they use mycoproteins in their vegetarian foods.

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