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After eating a problem food allergen, how long does it take to show up in body symps? And how long does it take to exit system? Thanks Dr!

1 doctor weighed in
Dr. John Chiu
Internal Medicine - Allergy & Immunology

In brief: 2 hours

Most allergic responses occur within 2 hours although reaction to red meat may not come on until 3-6 hours later. Most allergic responses from food should subside in less than a day.
As for how long traces of the food may remain in your body, it would depend on the kind of food.

In brief: 2 hours

Most allergic responses occur within 2 hours although reaction to red meat may not come on until 3-6 hours later. Most allergic responses from food should subside in less than a day.
As for how long traces of the food may remain in your body, it would depend on the kind of food.
Dr. John Chiu
Dr. John Chiu
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