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Caffeine and Health: Evidence-Based Deep Dives

Caffeine interacts with the body in ways that are well-studied but often misrepresented online. These pages review the actual evidence — what's established, what's associated but not causal, and what genuinely warrants a physician's attention. You'll find citations to DSM-5 criteria for caffeine-induced anxiety disorder, FDA safe-use guidance, the Drake 2013 sleep-disruption study, the Caldeira and Chieng meta-analyses on palpitations, and peer-reviewed research on CYP1A2 drug interactions. The goal is not to alarm or reassure by default — it's to give you the specific numbers and thresholds that let you make an informed decision about your own intake.

Sleep

The real 8–10 hour cutoff — Drake 2013, CYP1A2 genetics, and the "decaf is not zero" trap.

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Anxiety

DSM-5 caffeine-induced anxiety disorder — thresholds, tapering, and panic-disorder caution.

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Heart Palpitations

Caldeira 2013 and Chieng 2022 meta-analyses — plus emergency red-flag symptoms.

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ADHD

What the evidence actually shows — not a substitute for treatment.

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Medications

Full interaction table — fluvoxamine, ciprofloxacin, contraceptives, lithium, stimulants, and more.

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