Department of Epidemiology and Biostatistics, Ministry of Education Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, Hubei, China; Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 100022, China.
Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 100022, China.
Food Chem Toxicol. 2022 Jul;165:113102. doi: 10.1016/j.fct.2022.113102. Epub 2022 May 2.
Caffeine has known effects on the central nervous and cardiovascular systems. An intake up to 400 mg/day does not give rise to health concerns. Tea, a major source of caffeine, is highly consumed in China. However, the potential health risk of caffeine from tea has not been well evaluated. The present study assessed caffeine intake levels from tea for Chinese adult consumers. We collected 1,398 samples of green, black, dark, jasmine, oolong, white, and yellow tea from 17 provinces. The caffeine content was determined by HPLC. The average contents were 27 (oolong tea) - 43 (yellow tea) mg/g. The leaching rate of caffeine into the water was about 100%. Tea consumption data were from the National Beverage Consumption Survey 2013-2014. Monte Carlo simulations were applied to estimate the distribution of caffeine intake. The average caffeine intake from tea was 180 mg/day of all consumers. Green, dark, and black tea were the primary sources. Males (197 mg/day) consumed more caffeine than females (136 mg/day) on average, but females older than 71 years had the highest intake level (259 mg/day) among all subgroups. Over 90% of Chinese adult tea drinkers have caffeine intake under 400 mg/day.
咖啡因对中枢神经系统和心血管系统有已知的影响。每天摄入 400 毫克以下不会对健康造成担忧。茶是咖啡因的主要来源，在中国高度消费。然而，茶中咖啡因的潜在健康风险尚未得到很好的评估。本研究评估了中国成年消费者从茶中摄入咖啡因的水平。我们从 17 个省收集了 1398 份绿茶、红茶、黑茶、茉莉花茶、乌龙茶、白茶和黄茶样本。咖啡因含量通过高效液相色谱法测定。平均含量为 27（乌龙茶）-43（黄茶）毫克/克。咖啡因浸出率约为 100%。茶消费数据来自 2013-2014 年全国饮料消费调查。蒙特卡罗模拟用于估计咖啡因摄入量的分布。所有消费者从茶中摄入的平均咖啡因量为 180 毫克/天。绿茶、黑茶和红茶是主要来源。男性（197 毫克/天）的咖啡因摄入量平均高于女性（136 毫克/天），但 71 岁以上的女性在所有亚组中摄入水平最高（259 毫克/天）。超过 90%的中国成年饮茶者的咖啡因摄入量低于 400 毫克/天。
