Age Ageing ：儿童时期喝牛奶与老年时体质改善相关

　　英国学者的一项研究表明，儿童时期饮用牛奶与老年时体质改善和平衡不佳风险降低相关。论文发表于《年龄与衰老》[Age Ageing 2012, 41(6):776]。

　　研究者从前瞻性Boyd Orr人群和Caerphilly前瞻性研究中分别纳入了405和1195例受试者。当前年龄为63至48岁受试者接受系列运动测试。利用模型对年龄、性别、中心、社会经济环境、能量摄入、成年体重指数和共病校正之后，对测试结果加以分析。

　　结果显示，儿童时期牛奶高摄入与起立行走试验中步行时间增快5%（P=0.02）以及平衡不佳风险降低25%相关（P<0.07）。步行时间增快与钙和脂肪摄入增加相关，高蛋白摄入则可使平衡不佳风险降低29%。此外，成年时期蛋白摄入与步行时间呈正相关。

Childhood milk consumption is associated with better physical performance in old age

Background: studies have shown that milk and dairy consumption in adulthood have beneficial effects on health.

Methods: we examined the impact of childhood and adult diet on physical performance at age 63–86 years. The Boyd Orr cohort (n = 405) is a 65-year prospective study of children who took part in a 1930's survey; the Caerphilly Prospective Study (CaPS; n = 1,195) provides data from mid-life to old age. We hypothesised that higher intakes of childhood and adult milk, calcium, protein, fat and energy would be associated with a better performance.

Results: in fully adjusted models, a standard deviation (SD) increase in natural log-transformed childhood milk intake was associated with 5% faster walking times from the get-up and go test in Boyd Orr (95% CI: 1 to 9) and 25% lower odds of poor balance (OR: 0.75; 0.55 to 1.02). Childhood calcium intake was positively associated with walking times (4% faster per SD; 0 to 8) and a higher protein intake was associated with lower odds of poor balance (OR: 0.71; 0.54 to 0.92). In adulthood, protein intake was positively associated with walking times (2% faster per SD; 1 to 3; Boyd Orr and CaPS pooled data).

Conclusion: this is the first study to show positive associations of childhood milk intake with physical performance in old age.