Is CYP1A2 useful for Blutzucker?

The usefulness of CYP1A2 for blood sugar is scientifically weak. CYP1A2 is mainly known for metabolizing caffeine and some drugs. Some studies suggest that variants (e.g., rs762551) may modulate caffeine's effect on insulin sensitivity, but the effects are small, inconsistent, and not clinically actionable. For blood sugar regulation, diet, exercise, and weight are far more important. A CYP1A2 genetic test does not provide meaningful guidance for blood sugar management. The evidence is primarily mechanistic, not sufficient for recommendations.