New research from Flinders University suggests a link between heavy coffee consumption and reduced bone density in older women, while tea drinking might offer a slight benefit for bone health. The decade-long study tracked nearly 10,000 women aged 65 and older, examining how their daily beverage habits impacted bone mineral density (BMD), a key indicator for osteoporosis risk.
Osteoporosis is a significant global health issue, affecting roughly one in three women over 50 and leading to millions of fractures annually. Given that billions worldwide regularly consume coffee or tea, even minor effects on bone health could have widespread implications. This study stands out due to its extensive 10-year follow-up period, addressing mixed findings from previous, shorter-term research.
The study, using data from the Study of Osteoporotic Fractures, meticulously recorded participants' beverage intake and measured BMD at the hip and femoral neck over a decade. The results indicated that women who regularly drank tea showed slightly higher total hip BMD compared to non-tea drinkers. While the difference was modest, it was statistically significant and could translate into fewer fractures across large populations.
Coffee presented a more complex picture. Moderate consumption, around two to three cups daily, showed no negative impact on bone health. However, women consuming more than five cups per day exhibited lower BMD. This effect appeared more pronounced in women who also consumed alcohol. Conversely, the potential benefits of tea seemed more significant for women with obesity.
Researchers theorize that catechins, abundant in tea, may boost bone formation and slow bone loss. In contrast, caffeine in coffee, according to lab studies, might interfere with calcium absorption and bone metabolism, though adding milk could potentially mitigate these effects. While moderate coffee intake appears safe, very high consumption might be less ideal, particularly for women who drink alcohol.
The study authors emphasize that the observed differences were subtle and not substantial enough to warrant drastic changes to daily habits. They suggest that while calcium and vitamin D are crucial for bone health, daily beverages could also play a role. Enjoying a cup of tea might offer a simple, comforting way to support bone health in later life, whereas excessive coffee intake warrants caution.
