Coffee guides

Short reads on caffeine, health and coffee's history, plus how we judge a price drop. Every fact links to its source.

Coffee and your health: what the research says

The good, the not so good, how much caffeine is too much, and a calculator for your day. 8 sourcesRead the guide

How coffee travelled the world

A map of nine places, a timeline from Yemen to the 2019 auction record, and what famous names on a bag mean. 11 sourcesRead the guide

Jump to an answer

Each one opens the part of a guide that answers it.

Health guide

How much caffeine is too much?

Up to 400 mg a day for most healthy adults, and 200 mg in pregnancy.Health guide

Caffeine calculator

Add up your coffee and tea and see where your day lands.Health guide

Myth or fact?

Decaf, espresso, cancer and the 400 mg rule, checked against the sources.Health guide

Is French press coffee bad for cholesterol?

Unfiltered coffee keeps about 30 times more diterpenes than filtered.Health guide

Should I stop coffee after 5 p.m.?

What a 2013 sleep study found when caffeine came six hours before bed.History guide

Where was coffee first drunk?

Among Sufi communities in Yemen, by the late 1400s.History guide

The coffee timeline

From Yemen to the first espresso patents and the auction records.History guide

What do "Kona" or "Blue Mountain" mean on a bag?

Places, plants and ways of brewing: eight famous names explained.How it works

How do we spot a real price drop?

We compare today's price with the usual price over 30 days, not with the store's "was" price.

How we write these guides

The same rule as our prices: don't take a claim on trust, show where it comes from.

FDAEFSAMayo ClinicThe BMJIARCAASMHarvard HealthUNESCOWikipedia

  • Every claim links to its source. Public health agencies, peer-reviewed research and named reference works, listed at the end of each guide.
  • Links, not causes. Most coffee research is observational. When a study shows a link, we call it a link.
  • Not medical advice. The health guide is general information. Talk to your doctor about your own caffeine limits.