What's inside coffee, and where does it go in your body?
Caffeine plus hundreds of compounds. Moderate intake is associated with neutral-to-lower risk of several diseases.
Inside a cup
About 95 mg caffeine in 8 oz brewed (varies widely), potassium, polyphenols, almost no calories black.
Pregnancy
Pregnant people are generally advised to limit caffeine to about 200 mg/day.
Evidence & sources
Coffee consumption is more often associated with benefit than harm across health outcomes, at around 3–4 cups per day. Evidence: moderate. Known: Umbrella review of meta-analyses. Unknown: Mostly observational. Source: Poole et al., BMJ, Coffee consumption and health: umbrella review of meta-analyses (2017).