When researchers studied whether a mother's diet during pregnancy could shape her baby's allergy risk, they asked mothers to avoid eggs entirely — both during pregnancy and breastfeeding. The goal was to test whether removing this common allergen from the diet would lower egg allergy rates in infants. Compliance turned out to be very hard to maintain, and too few mothers followed the restriction closely enough to draw firm conclusions. As a result, the effect of egg intake on infant allergy remains unclear.