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首页> 外文期刊>European journal of clinical nutrition >Dietary acid-base balance and intake of bone-related nutrients in Cambridge teenagers.
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Dietary acid-base balance and intake of bone-related nutrients in Cambridge teenagers.

机译：剑桥青少年的饮食酸碱平衡和骨骼相关营养素的摄入。

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OBJECTIVES: To evaluate the diet of 16-18-y-old boys and girls with particular reference to intakes of nutrients believed to affect bone health and dietary acid-base balance. DESIGN: A 7-day food diary was completed between the months of October and December. SETTING: Cambridge, UK. SUBJECTS: A total of 111 boys and 101 girls aged 16-18 y who were recruited into the Cambridge Bone Studies. MAIN OUTCOME MEASURES: Mean daily intakes of foods and selected nutrients (protein, calcium, phosphorus, magnesium, potassium, vitamins C and K) were calculated. Two estimates of acid-base balance were calculated from the diet using the formulae of Remer (net acid excretion, estimated indirectly; NAE(ind)) and Frassetto (protein/potassium ratio). RESULTS: Mean calcium and phosphorus intakes were above the UK Reference Nutrient intake (RNI). In all, 39% of the boys and 36% of the girls had vitamin K intakes lower than 1 microg/kg body weight/day. Calcium intake was positively correlated with all other nutrients exceptvitamins C and K. Boys had a significantly higher estimated net acid excretion (NAE(ind)) than girls (P<0.001). Although a strong correlation (r=0.76, P<0.001) was found between the two methods, at higher acid levels a divergence was observed. A significant positive correlation was found between NAE(ind) and the weight consumed per day of milk, cheese, meat and cereal foods and a negative correlation was found with the weight of potatoes and fruit. Diet composition is such that a lower NAE(ind) is accompanied by a lower calcium intake. CONCLUSIONS: The interpretation of the effects of calcium and other nutrients on bone cannot be considered in isolation from the other components of the diet. These results challenge some of the accepted perceptions about what constitutes an optimal diet for the promotion of bone health in adolescents.
机译：目的：评估16-18岁男孩和女孩的饮食，尤其要考虑其认为会影响骨骼健康和饮食酸碱平衡的营养摄入。设计：10月至12月之间完成了7天的食物日记。地点：英国剑桥。受试者：年龄在18-18岁之间的111位男孩和101位女孩被纳入“剑桥骨研究”。主要观察指标：计算食物和选定营养素（蛋白质，钙，磷，镁，钾，维生素C和K）的平均每日摄入量。使用Remer（净酸排泄，间接估计; NAE（ind））和Frassetto（蛋白质/钾比）的公式，从饮食中计算出酸碱平衡的两个估计值。结果：平均钙和磷摄入量高于英国参考营养摄入量（RNI）。总计，39％的男孩和36％的女孩的维生素K摄入量低于1微克/千克体重/天。钙的摄入与所有其他营养素（维生素C和K）呈正相关。男孩的估计净酸排泄量（NAE（ind））明显高于女孩（P <0.001）。尽管在两种方法之间发现了很强的相关性（r = 0.76，P <0.001），但在较高的酸水平下会观察到差异。 NAE（ind）与每天摄入的牛奶，奶酪，肉类和谷物食品的重量之间存在显着的正相关，而与马铃薯和水果的重量之间存在负相关。饮食组成要使较低的NAE（ind）伴随较低的钙摄入量。结论：钙和其他营养素对骨骼的影响的解释不能与饮食中的其他成分分开考虑。这些结果挑战了一些公认的观念，即什么构成了促进青少年骨骼健康的最佳饮食。

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