What role does Insulin play in allergy?

Insulin is primarily known for its role in glucose metabolism, but it also has immunomodulatory effects. It can influence histamine release from mast cells and affect T‑cell differentiation, potentially shifting the immune balance toward a pro‑allergic (Th2) response. Some observational studies link hyperinsulinemia with allergic conditions like asthma or eczema, but the evidence is mostly mechanistic or associative, not causal. Insulin resistance and metabolic syndrome may exacerbate inflammation, but direct evidence for insulin causing allergies is weak. MyBody‑X tests may include insulin or glucose markers, but these are not validated for allergy prediction. A healthy metabolic profile is beneficial overall, but insulin's specific role in allergy remains unclear and should not be overinterpreted.