What to watch with LCT and allergy?

The question about LCT (lactase persistence) and allergies is complex. LCT variants determine the ability to digest lactose, not allergy risk. However, symptoms of lactose intolerance (bloating, diarrhea) can be confused with cow's milk allergy. True milk allergy is IgE-mediated and involves proteins, not lactose. A DNA test for LCT says nothing about allergies. If allergy is suspected, specific IgE tests or provocation tests are needed. Beware of self-tests that conflate lactose intolerance and allergy. Evidence for a direct link is weak; they are distinct mechanisms. Consult a doctor before eliminating foods.