Too much coffee may weaken bones, study finds

What the research found

Study (observational). A 10-year follow-up of nearly 10,000 older women associated tea drinking with slightly higher hip bone density. Moderate coffee was not clearly harmful; more than five cups a day tracked with lower density. Associations are not prescriptions. Food and drink choices belong with a clinician if you have bone disease or take medications.

Evidence level: Human study. A study in people, but an association isn't proof of cause.

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