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2. Non-celiac gluten sensitivity - Wikipedia

   en.wikipedia.org/wiki/Non-celiac_gluten_sensitivity

   It is excluded when there are normal levels of serum IgE antibodies to gluten proteins and wheat fractions, and no skin reaction to prick tests for wheat allergy. [6] Nevertheless, these tests are not always completely reliable. [11] If an allergic reaction can not be clearly identified, the diagnosis should be confirmed by food provocation ...

3. Food intolerance - Wikipedia

   en.wikipedia.org/wiki/Food_intolerance

   Food intolerance is a detrimental reaction, often delayed, to a food, beverage, food additive, or compound found in foods that produces symptoms in one or more body organs and systems, but generally refers to reactions other than food allergy. Food hypersensitivity is used to refer broadly to both food intolerances and food allergies.

4. Alpha-gal syndrome - Wikipedia

   en.wikipedia.org/wiki/Alpha-gal_syndrome

   Alpha-gal syndrome (AGS), also known as alpha-gal allergy or mammalian meat allergy (MMA), [1] is a type of acquired allergy characterized by a delayed onset of symptoms (3–8 hours) after ingesting mammalian meat.

5. Allergy test - Wikipedia

   en.wikipedia.org/wiki/Allergy_test

   For an allergy blood test, a sample of the patient's blood is sent to a laboratory for analysis. Allergy blood tests measure the presence of IgE antibodies to specific foods, pollens, mites, animals, insects and other environmental factors. (IgE, short for "immunoglobulin E", is the antibody that triggers food allergy symptoms.)

6. Lactose intolerance - Wikipedia

   en.wikipedia.org/wiki/Lactose_intolerance

   In a hydrogen breath test, the most accurate lactose intolerance test, after an overnight fast, 25 grams of lactose (in a solution with water) are swallowed. If the lactose cannot be digested, enteric bacteria metabolize it and produce hydrogen, which, along with methane, if produced, can be detected on the patient's breath by a clinical gas ...

7. Elimination diet - Wikipedia

   en.wikipedia.org/wiki/Elimination_diet

   Food allergy is principally diagnosed by careful history and examination. When reactions occur immediately after certain food ingestion then diagnosis is straight forward and can be documented by using carefully performed tests such as the skin prick test and the radioallergosorbent test RAST to detect specific IgE antibodies to specific food proteins and aero-allergens.