Can food intolerances develop suddenly in adults?
Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS
Yes. Lactose intolerance commonly arrives in adulthood as the lactase enzyme fades, sometimes triggered by a stomach infection. A gut still recovering from illness can also react to foods it previously handled.
True food allergy appearing new in adults is rarer but real.
Test the simple ones with structured removal and rechallenge over two weeks each. Skip IgG food intolerance panels sold online; they measure exposure, not intolerance, and mislead expensively. Persistent symptoms deserve a doctor and possibly a celiac test before any gluten removal.
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