New research published in the journal Nutrients has found that very high coffee consumption may be linked to lower bone mineral density in older women, while moderate intake appears safe. The decade-long study, conducted by researchers at Flinders University, tracked nearly 10,000 women aged 65 and older to examine how everyday beverage habits relate to bone health.
Heavy Coffee Intake Linked to Lower Bone Density in New Study
Osteoporosis is a major global health challenge that causes weak, brittle bones and millions of fractures each year. The condition affects roughly one in three women over the age of 50. Because billions of people consume coffee and tea daily, researchers sought to understand whether these popular drinks influence bone mineral density at the hip and femoral neck, two regions closely tied to fracture risk.
How Coffee and Tea Affect Bone Health Differently
The study analyzed data from the Study of Osteoporotic Fractures, repeatedly assessing participants’ beverage habits and measuring bone density over a 10-year period using advanced imaging methods.
The findings revealed a stark divide between the two beverages:
- Moderate Coffee: Drinking about two to three cups of coffee per day was not associated with harm to bone health.
- Heavy Coffee: Drinking more than five cups of coffee daily was linked to significantly lower hip bone density.
- Tea Consumption: Women who drank tea showed slightly higher total hip bone mineral density compared to those who did not drink tea.
Coffee's caffeine content, by contrast, has been shown in laboratory studies to interfere with calcium absorption and bone metabolism, though these effects are small and can be offset by adding milk,
explains Ryan Liu from Flinders University. Conversely, compounds called catechins found abundantly in tea may help promote bone formation and slow bone breakdown, according to researchers.
Lifestyle Factors and Broader Implications
The research also highlighted that lifestyle factors can interact with or accompany beverage habits. Women who consumed very high amounts of coffee alongside higher lifetime alcohol use tended to have lower bone density. Additionally, the study noted that tea appeared particularly beneficial for women with obesity in interaction analyses.
Even small improvements in bone density can translate into fewer fractures across large groups,
says Adjunct Associate Professor Enwu Liu from the College of Medicine and Public Health. However, authors caution that the observed differences are not a standalone strategy for preventing osteoporosis.
Practical Guidance for Older Adults
Experts emphasize that daily beverage choices are only one piece of a broader health routine. Calcium, vitamin D, and regular strength training remain the cornerstones of bone health, alongside avoiding smoking and excessive alcohol use.
While moderate coffee drinking appears safe, very high consumption may not be ideal, especially for women who drink alcohol,
Enwu Liu notes, adding that unsweetened tea varieties without added sugar are preferable. For older women, enjoying a daily cup of tea may be more than a comforting ritual, it could be a small step toward stronger bones.
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