People who show adverse reactions to foods such as increased pulse rate, nausea, and hives, but do NOT show antibodies to the offending foods, are displaying which of the following abnormalities?

Question

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People who show adverse reactions to foods but do not show antibodies to the offending foods are displaying food intolerances. Food intolerances can cause symptoms such as stomach upset, bloating, and headaches, but do not involve the immune system as in the case of allergies.

People Who Show Adverse Reactions to Foods Such as Increased