What role does CYP1A2 play in blood sugar?

CYP1A2 is a cytochrome P450 enzyme primarily responsible for metabolizing caffeine and certain drugs. A direct role in blood sugar regulation is not established. The link to blood glucose is indirect via caffeine metabolism: caffeine can transiently reduce insulin sensitivity and raise blood sugar. Individuals with a genetic variant (e.g., rs762551, *1F allele) are classified as 'slow caffeine metabolizers' and may be more sensitive to caffeine's metabolic effects. Some observational studies suggest that high caffeine intake in slow metabolizers is associated with a modestly increased risk of impaired glucose tolerance or type 2 diabetes. However, the evidence is moderate and insufficient for clinical recommendations. Crucially, a CYP1A2 DNA test alone does not predict current blood sugar levels; glucose must be measured directly. Marketing claims labeling CYP1A2 as a 'blood sugar gene' are misleading. The actual effect is small and context-dependent (caffeine intake, lifestyle). Safety note: Slow metabolizers consuming high amounts of caffeine may experience elevated blood pressure and potentially adverse effects on glucose metabolism.