Association of Coffee and Tea Intake with Bone Mineral Density and Hip Fracture: A Meta-Analysis.

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• Moderate consumption of coffee and tea is generally safe, but it may be important to be mindful of the amount of consumption, especially if at risk for osteoporosis or fractures.
• To maintain bone health, coffee and tea intake should be balanced with a diet rich in calcium and vitamin D, and regular engagement in weight-bearing exercise.

Introduction

• The study tackles the escalating global health issue of osteoporosis, a condition characterised by diminished bone mass and increased fragility, which significantly raises the risk of fractures, particularly in the hip.
• Given the conflicting results from earlier research on the impact of coffee and tea consumption on bone health, this meta-analysis sought to determine whether these widely consumed beverages influence bone mineral density (BMD) and the likelihood of hip fractures.

Methods

• The authors conducted a systematic review and meta-analysis by searching PubMed, MEDLINE, and Embase for studies published up until 2022.
• After exclusions the meta-analysis incorporated 20 studies with a total of 508,312 participants.
• Studies included were observational and focused on the separate impact coffee and tea intake had on bone mineral density and hip fracture risk.
• Studies were omitted if they focussed on specific disease groups or if bone mineral density and hip fracture fell below 95% confidence intervals (CIs).
• The analysis evaluated mean differences (MD) for bone mineral density and pooled hazard ratios (HR) for hip fracture risk.
• Coffee and tea intake were categorised into high and low consumption across all studies, based on defined thresholds.

Results

• No significant association was shown between coffee intake (7 studies) and BMD (pooled MD of 0.020, 95% CI: -0.003 to 0.044) or hip fracture risk (pooled HR of 1.008, 95% CI: 0.760 to 1.337).
• Tea intake (4 studies) was not significantly associated with BMD (pooled MD of 0.039, 95% CI: -0.012 to 0.090) or hip fracture risk (pooled HR of 0.93, 95% CI: 0.84 to 1.03).

Conclusion

• The findings suggest that daily consumption of coffee or tea does not have a significant impact on bone mineral density or the risk of hip fractures. Therefore, concerns regarding the detrimental effects of these beverages on bone health may be unfounded.
• Due to limitations of heterogeneity in relation to dose response analyses the authors call for carefully designed large-scale cohort studies to give further clarity of the impact on coffee and tea on osteoporosis.

• While further studies take place personalised nutrition advice should tailor advice to patients who have high tea and/or coffee intake to include the potential impact of caffeine on calcium and vitamin D absorption.
• Clients with a family history of osteoporosis or other risk factors should receive tailored advice, potentially limiting coffee and tea intake as part of a broader strategy to maintain bone health.

• For tailored guidelines future studies could establish a more precise threshold for what constitutes high and low consumption of these beverages. This would help to clarify the dose-response relationship and bone health.
• Further research should investigate the underlying biological mechanisms by which coffee and tea influence BMD and fracture risk. This could involve studying the roles of caffeine, polyphenols, and other compounds in bone metabolism.
• Examining how coffee and tea consumption interacts with other dietary factors (like calcium and vitamin D intake) and lifestyle choices (such as physical activity) could provide a more comprehensive understanding of their impact on bone health.
• Future research should focus on diverse populations to understand how factors such as ethnicity, age, gender etc. might modify the effects of coffee and tea on bone health.