Can food intolerances develop suddenly in adults?
Yes, food intolerances can develop suddenly in adults. 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.
Source: NHS, food intolerance
See a doctor promptly if
- Food sticking or difficulty swallowing, or pain on swallowing
- Unintentional weight loss with indigestion or bloating
- Vomiting blood, or vomit that looks like coffee grounds
- Black tarry stools, or a new diagnosis of iron deficiency anemia
- Persistent vomiting, or a mass felt in the upper abdomen
- New persistent bloating on most days for three weeks or more, especially in women over 50
Try the symptom diary10 seconds a day, free, nothing to installA reaction is a pair: what you ate and how long after. Written down for two weeks, the pair usually names itself.
Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
Unglamorous and well proven
Daily psyllium helps constipation, modestly lowers cholesterol, and steadies blood sugar after meals. Start small and drink water with it.
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