Myths vs facts: IgE Allergietest and Blutzucker

A common myth is that IgE allergy tests (e.g., for foods) can also indicate intolerances or even blood sugar levels. In reality, IgE tests only measure immediate-type allergies (Type I) triggered by histamine release from mast cells. Blood sugar is regulated by carbohydrate intake, insulin, and glucagon – not by IgE. A positive IgE test for a food does not mean that food affects your blood glucose. Many DTC companies market IgE panels misleadingly as 'food intolerance tests' or 'metabolic checks'. This is not scientifically supported. If you want to understand your blood sugar, measure fasting glucose, HbA1c, or an oral glucose tolerance test (OGTT) – not IgE values. Caveat: Untreated hay fever can indirectly affect blood sugar via sleep disruption or stress, but that is not a direct IgE effect. Do not rely on IgE tests for diabetes screening.