Let's first look for a moment at some common symptoms of "food allergies". There is a wide variety of symptoms, from no noticeable symptoms at all to anaphylactic shock (serious and uncommon). Some others are: diarrhea, excessive gas/bloating, fatigue, weakness, constipation, fatigue, joint pain, muscle pain, abdominal pain/cramps, low desire to eat, foul smelling/floating bowel movements, gloomy feeling, poor concentration, anemia, low mental energy, nausea, headaches, irritability, uncontrolled weight gain/loss, lactose intolerance, skin rash.

In brief, the immune system has a variety of different ways in which it may react to antigenic (foreign) substances in the body. I have heard the terms "allergy", "intolerance" and "sensitivity" (A/I/S) used interchangeably, without a lot of definition. My experience tells me that these are not interchangeable terms. Instead, they should be differentiated by their different responses in the body.