Warning over new ingredient in thousands of foods causing 'fatal reaction'Experts say there could be an increase in the number of people with allergic reactionsView Image Green pea protein powderExperts say a 'new ingredient' now found in thousands of foods families across the UK eat every day could be behind a spike in potentially fatal reactions. ‌Pea protein is often used as a meat alternative in vegetarian and vegan foods - as well as being used to bulk or emulsofy foods and improve texture. ‌It is also sold as a protein supplement and is the basis of some supplement drinks and shakes. ‌A spokesman for the charity said: "The rise in pea allergy might be linked to the rise of foods containing ingredients such as pea protein and pea fibre." What happens if someone with a pea allergy eats pea protein?