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Settled ground

The no-coffee headache is caffeine withdrawal, on a clock

One cup of coffee a day, 100mg of caffeine, is the smallest habit shown to produce withdrawal: ten validated symptoms, starting 12 to 24 hours after the last dose and running as long as nine days.

Caffeine

The morning without coffee gets treated as a mood. It has a name and a timetable: 100mg a day, about one cup, is the lowest intake shown to produce withdrawal, and ten validated symptoms follow, beginning 12 to 24 hours after the last dose. Headache, fatigue, dulled alertness, irritability and low mood are among them. Those are population ranges, and plenty of people stop and feel nothing at all. What looks like needing coffee to function is often the last cup wearing off.

The findings behind this

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Physical & bodyYou do not need a big coffee habit to get withdrawal headaches

A daily 100 mg of caffeine, about one cup of coffee, is the lowest intake shown to do it. Symptoms start 12 to 24 hours after the last dose and can run nine days.

★★★Well replicated — this finding’s sources average out to meta-analyses, systematic reviews or high-powered trials.Those timings are population ranges, and plenty of people stop and feel nothing at all. The 100mg figure is the lowest daily intake shown to produce withdrawal, not the usual one. This is a critical review of 57 experiments and 9 surveys rather than a pooled statistical analysis, though nothing since has replaced it.Click to keep this openBoost energyCaffeine

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