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Base foodLow concern
Coffee
In plain words
The short version
Contains both caffeine and chlorogenic acids; like tea, it lowers iron uptake from the meal it accompanies.
Why it's green
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Safety profile
Chlorogenic acids bind non-haem iron much as tea tannins do, reducing absorption from the same meal. Caffeine also increases how much calcium is passed in urine, though the amounts are small and are offset by ordinary calcium intake.
The detail
Educational information only. Not medical or dietary advice.