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"What is food to one man may be fierce poison to another".
- Lucretius, circa 75 BC - 

The Difference Between Delayed Food
Allergy and Immediate Food Allergy


Delayed Onset
(IgG-Mediated)
Immediate Onset
(IgE-Mediated)
Multiple foods can be involved  Rarely more than 1-2 foods involved. 
Large amount of the food needed to provoke symptoms; reactions may not occur after single food challenge.  Even trace amounts of food can trigger severe life threatening reactions. 
Reactions occur 2-24 hours after eating reactive foods; rarely up to 72 hours have reactions been reported.  Reactions occur 2 hours or less after consumption of offending foods. 
Any organ system can be involved in reaction including the classic allergic areas.  Primarily affects: Skin, airway, and digestive system. Classic processes: hives, asthma, eczema, vomiting, diarrhea, and anaphylaxis. 
Very common (children, and adults) Over 50 medical problems caused, provoked or worsened by food sensitivities.  Rare in adults. 
Addictive cravings and withdrawal seen in 20-30%.  Addictive cravings never seen. 
Because multiple foods and delayed onset of symptoms, the offending foods rarely self-diagnosed.  Offending food is often diagnosed because of immediate reaction. 
Allergic foods are favorite foods.  Allergic food is a rarely eaten food. 
Symptoms clear after avoidance for 6 months.  A permanent fixed allergy. 
IgE RAST negative; IgG positive (type II) often.  IgE and skin test positive (type I) reaction. 
IgG food immune complexes (type E) and cellular (type IV) reactions common.  IgG not involved. 
Sensitized lymphocytes, eosinophils, platelets, release of leukotrienes prevalent.  Mast cell release of histamine and tryptase involved. 

 
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© 2008 Optimum Health Resource Laboratories, Inc.
 
419 South Federal Highway 
Dania, Florida  33004 USA
Telephone: (305) 757-2570
info@optimumhealthresource.com        www.optimumhealthresource.com