Researchers at Flinders University found that while moderate coffee intake is safe, high consumption may affect bone health, whereas tea consumption may offer small benefits for older women.

A 10-year study by Flinders University researchers, published in the journal Nutrients, examined the relationship between coffee and tea consumption and bone mineral density (BMD) in older women. The study utilized data from the Study of Osteoporotic Fractures to monitor changes in hip and femoral neck density. Findings suggest that while tea may provide modest benefits for bone health, consuming more than five cups of coffee daily could have negative effects.

Impact of Coffee and Tea

The study found that women who drank tea had slightly higher total hip BMD compared to non-tea drinkers. Researchers suggest that catechins, compounds found in tea, may help promote bone formation and slow bone breakdown. Conversely, while moderate coffee consumption of two to three cups per day showed no association with bone health issues, drinking more than five cups daily was linked to lower BMD. Researchers noted that the effects of these beverages can be influenced by other lifestyle factors. For instance, the negative impact of high coffee consumption appeared stronger in women with higher lifetime alcohol intake, while the benefits of tea were more pronounced among women with obesity.

Study Context and Recommendations

The authors emphasized that the observed differences in bone density were modest and do not necessitate major changes to daily habits. They noted that caffeine’s potential interference with calcium absorption and bone metabolism is small and can be offset by adding milk to coffee. The study concludes that while calcium and vitamin D remain the primary factors for bone health, regular tea consumption may serve as a simple, supportive habit for older women.