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.

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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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Caffeine Withdrawal

Symptoms, hour-by-hour timeline, and the evidence-backed strategies that shorten the worst of it.

How to Cut Back

A 21-day taper plan that minimizes headaches, brain fog and rebound fatigue.

Caffeine Reset

Restore caffeine sensitivity in 14-21 days - without going to zero.

Mindful Caffeine

Eight habits that separate intentional users from compulsive drinkers.

Caffeine Tracker App

What a real caffeine tracker should do - half-life, cutoff alerts, source database.

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