Final answer:
The statement is false; a person does not need to consume a product more than once to have an allergic reaction. Allergies occur when the immune system mistakenly responds to a harmless protein as a threat, leading to a type I hypersensitivity response that can manifest with various symptoms.
Step-by-step explanation:
The statement "You have to consume the product more than once to have an allergic reaction" is false. An allergic reaction can occur even upon first exposure to an allergen. An allergy is triggered when a person's immune system erroneously reacts to a typically harmless protein in the environment as if it were a threat. The body responds to food allergies by producing immunoglobulin E (IgE) antibodies that can lead to a type I hypersensitivity response, causing various unpleasant symptoms such as itching, swelling, and in severe cases, anaphylaxis. Allergens, which are the substances causing an allergic reaction, can range from food items to pollen or even animal dander.
Allergic reactions do not necessarily require multiple exposures; a person can become sensitized to an allergen after a single exposure, with symptoms manifesting upon subsequent contact. However, repeated exposure can lead to a heightened immune response.