CYP1A2 Gene: Cytochrome P450 1A2

The CYP1A2 gene encodes a liver enzyme responsible for metabolizing caffeine and many medications. Variants in this gene explain why some people can drink coffee late at night while others feel jittery from a single cup.

What Does the CYP1A2 Gene Do?

CYP1A2 enzyme breaks down caffeine in the liver, converting it to paraxanthine and other metabolites. The speed of this process determines how long caffeine remains active in your body.

Key CYP1A2 Variants

rs762551: The A allele = fast metabolizer (caffeine cleared quickly). The C allele = slow metabolizer (caffeine effects last longer). About 50% of people are slow metabolizers.

Health Impacts

• Caffeine sensitivity and tolerance
• Sleep quality after caffeine consumption
• Cardiovascular effects of coffee
• Drug metabolism (certain medications)
• Antioxidant processing from vegetables

Evidence-Based Recommendations

• Slow metabolizers: Limit caffeine to morning, max 200mg/day
• Fast metabolizers: May safely consume more caffeine
• Slow metabolizers: Coffee may increase heart disease risk
• Fast metabolizers: Moderate coffee may be protective
• Consider caffeine-free alternatives if slow metabolizer

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