Hogenkamp P S, Jerling J C, Hoekstra T, Melse-Boonstra A, MacIntyre U E
School of Physiology, Nutrition and Consumer Science, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa.
Br J Nutr. 2008 Aug;100(2):430-7. doi: 10.1017/S000711450889441X. Epub 2008 Feb 14.
The association between black tea consumption and iron status was investigated in a sample of African adults participating in the cross-sectional THUSA (Transition and Health during Urbanization of South Africans) study in the North West Province, South Africa. Data were analysed from 1605 apparently healthy adults aged 15-65 years by demographic and FFQ, anthropometric measurements and biochemical analyses. The main outcome measures were Hb and serum ferritin concentrations. No associations were seen between black tea consumption and concentrations of serum ferritin (men P = 0.059; women P = 0.49) or Hb (men P = 0.33; women P = 0.49). Logistic regression showed that tea consumption did not significantly increase risk for iron deficiency (men: OR 1.36; 95 % CI 0.99, 1.87; women: OR 0.98; 95 % CI 0.84, 1.13) nor for iron deficiency anaemia (men: OR 1.28; 95 % CI 0.84, 1.96; women: OR 0.93; 95 % CI 0.78, 1.11). Prevalence of iron deficiency and iron deficiency anaemia was especially high in women: 21.6 and 14.6 %, respectively. However, the likelihood of iron deficiency and iron deficiency anaemia was not significantly explained by tea consumption in sub-populations which were assumed to be at risk for iron deficiency. Regression of serum ferritin levels on tea consumption in women <or= 40 years, adults with a daily iron intake <or= 5.80 mg and adults with ferritin levels <or= 26.60 microg/l, respectively, showed P values in the range of 0.28-0.88. Our findings demonstrate that iron deficiency and iron deficiency anaemia is not significantly explained by black tea consumption in a black adult population in South Africa. Tea intake was also not shown to be related to iron status in several sub-populations at risk for iron deficiency.
在南非西北省参与横断面THUSA（南非人城市化过程中的转型与健康）研究的非洲成年人样本中，研究了饮用红茶与铁状态之间的关联。通过人口统计学和食物频率问卷、人体测量和生化分析，对1605名年龄在15至65岁之间的貌似健康的成年人的数据进行了分析。主要结局指标为血红蛋白（Hb）和血清铁蛋白浓度。未发现饮用红茶与血清铁蛋白浓度（男性P = 0.059；女性P = 0.49）或Hb（男性P = 0.33；女性P = 0.49）之间存在关联。逻辑回归显示，饮茶并未显著增加缺铁风险（男性：比值比[OR] 1.36；95%置信区间[CI] 0.99，1.87；女性：OR 0.98；95% CI 0.84，1.13），也未增加缺铁性贫血风险（男性：OR 1.28；95% CI 0.84，1.96；女性：OR 0.93；95% CI 0.78，1.11）。缺铁和缺铁性贫血的患病率在女性中尤其高，分别为21.6%和14.6%。然而，在假定有缺铁风险的亚人群中，饮茶并未显著解释缺铁和缺铁性贫血的可能性。分别对40岁及以下女性、每日铁摄入量≤5.80毫克的成年人以及铁蛋白水平≤26.60微克/升的成年人的血清铁蛋白水平与饮茶情况进行回归分析，P值在0.28至0.88之间。我们的研究结果表明，在南非黑人成年人群中，饮用红茶并不能显著解释缺铁和缺铁性贫血情况。在几个有缺铁风险的亚人群中，饮茶也未显示出与铁状态相关。
