How are FTO and Allergie related?

The relationship between FTO (fat mass and obesity-associated gene) and allergies is not clearly established. FTO is primarily known for its strong association with body mass index (BMI). Some genome-wide association studies (GWAS) have hinted at links between FTO variants and allergic conditions like asthma or hay fever, but these may be indirect via BMI – obesity is a known risk factor for allergies. The evidence is therefore best classified as 'GWAS' or 'unclear'. No direct causal mechanism connecting FTO to allergic immune responses has been confirmed. A DNA test for FTO cannot diagnose or predict allergies. For allergy assessment, clinical tests (IgE, skin prick) and medical consultation remain essential. Nutrigenetics offers only limited insight here.