Tag: CYP1A2

Illustration of caffeine absorption and metabolism through the liver showing CYP1A2 enzyme and metabolites
ExplainersPerspectives

Why Coffee Affects Everyone Differently: The Science of Caffeine Metabolism

Caffeine metabolism is governed by liver enzymes, genetics, and lifestyle factors, explaining why coffee affects different people dramatically differently. The…

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GMJ Perspectives Desk
Infographic showing CYP1A2 genotype distribution (AA 45%, AC 44%, CC 11%) and caffeine half-life clearance times
Clinical UpdatesExplainersNew StudiesPerspectivesPracticeResearch Digest

Why Coffee’s Heart Risk Depends on Your Genes, Not Headlines

Whether coffee raises your heart disease risk depends almost entirely on a single genetic variant in the CYP1A2 enzyme. About…

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GMJ Practice Desk
Diagram showing caffeine half-life variation across fast and slow metabolizers, smokers, and contraceptive users
ExplainersNew StudiesPerspectivesResearch Digest

Why the ‘2pm coffee cutoff’ is a myth: genetics and lifestyle create a 15-fold range in caffeine metabolism

A new systematic review reveals that caffeine half-life varies 15- to 40-fold across healthy adults, making the popular '2pm cutoff'…

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GMJ Perspectives Desk
Chart showing dramatic variation in caffeine elimination times across different metabolizer types
New Studies

Why the ‘2pm Coffee Rule’ Fails: Metabolism Varies 5-Fold Between Individuals

New research reveals caffeine elimination varies 5-fold between individuals, making the popular '2pm coffee rule' ineffective for many. Genetic and…

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GMJ Research Desk

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