Coffee & caffeine

For most people, moderate coffee is not just safe — it tracks with living longer. The real levers are timing, filtration and your own tolerance.

Start today

Enjoy your coffee before early afternoon — make your last cup at least 8–10 hours before bed.

Why it matters

Coffee delivers caffeine (alertness, performance) plus polyphenols. Moderate intake is consistently linked to lower mortality — but it can wreck sleep and spike anxiety if mistimed or overdone.

The evidence (moderate)

Large cohort studies consistently associate ~3–5 cups/day with lower all-cause and cardiovascular mortality, and caffeine's acute effects on alertness and performance are well established. Unfiltered coffee raises LDL via cafestol; a paper filter removes most of it.

Where it's thin: The mortality link is observational — coffee drinkers differ from non-drinkers and no long trial proves cause. Individual caffeine metabolism varies genetically, changing both the benefit and the jitter/sleep cost.

How to do it

• Moderate coffee (about 3–5 cups) is fine for most adults
• Stop caffeine 8–10 hours before bed
• Watch what you add — syrup and sugar can undo the benefit
• Use a paper filter (drip / pour-over) to cut the LDL-raising oils in unfiltered coffee (French press, espresso, boiled)
• Notice your own response: jitters, reflux or poor sleep are real signals to cut back or drink earlier
• Caffeine peaks ~30–60 min after drinking and lingers for hours
• Genetics make some people "fast" and others "slow" caffeine metabolisers — slow metabolisers feel more cardiovascular and anxiety effects
• Tolerance builds; a periodic lower-caffeine stretch restores the effect
• Caffeine before training can genuinely boost performance
• The mortality association is strikingly consistent across cohorts and even holds for decaf in some analyses — pointing to compounds beyond caffeine
• Cafestol and kahweol in unfiltered coffee measurably raise LDL; the filter is the fix, not quitting
• Late-day caffeine measurably reduces deep sleep even when you still fall asleep fine

Medical check first for some people

Ask a clinician or pharmacist about your limit if you are pregnant, trying to conceive or breastfeeding; have palpitations/arrhythmia symptoms, uncontrolled high blood pressure, panic/anxiety, reflux or severe sleep problems; or take medication that may interact with caffeine. This does not mean everyone with a stable condition must avoid coffee.

Safety — read before starting

For most healthy adults, total caffeine up to about 400 mg/day is not generally associated with negative effects, but sensitivity varies and cup size is unreliable. Count all caffeine sources. Energy drinks and concentrated caffeine products are not equivalent to ordinary coffee.

Stop signs

Reduce or stop caffeine and seek advice for recurrent palpitations, marked anxiety, tremor, vomiting, severe insomnia or a sustained blood-pressure rise. Chest pain, fainting, severe breathlessness or a persistent rapid/irregular heartbeat needs urgent assessment.