Allergy Versus Intolerance

Basically they can present with similar symptoms but the main difference is an allergy will prompt the body to attack the intruder with antibodies. Said another way, an allergy will affect the immune system whereas with a food intolerance the immune system will not get involved. Another difference is that an allergy happens pretty immediately in reaction to a small amount of the allergen whereas a food intolerance needs a larger amount to create a reaction and can happen anywhere from 45 minutes to two days afterwards.

Still I don't know what happened yesterday...