Because iodine is added to cattle feed, milk and dairy products have become a major source of dietary iodine in Britain. The mean iodine concentrations of milk supplied to seven towns in England were measured each month throughout 1 year. Values were more than twice those recorded 20 years ago. There were large differences between the towns, with average annual concentrations ranging from 130 to 200 micrograms/l. Within the towns there were up to four-fold variations between the peak values in February/March and lowest values in June. The similarity between the monthly variations in milk iodine and seasonality in the onset of thyrotoxicosis suggests that iodine concentrations in milk and dairy products may now have reached harmful levels. Control of high winter levels in areas of Britain which were previously iodine deficient may now be necessary.

译文

由于牛饲料中添加了碘,牛奶和乳制品已成为英国饮食碘的主要来源。在一年中,每月测量提供给英格兰七个城镇的牛奶的平均碘浓度。价值是20年前记录的两倍多。城镇之间差异很大,年平均浓度范围为130至200微克/升。在城镇内,2月/3月的峰值与6月的最低值之间的变化高达四倍。牛奶碘的每月变化与甲状腺毒症发作的季节性之间的相似性表明,牛奶和乳制品中的碘浓度现在可能已达到有害水平。现在可能有必要控制以前缺碘的英国地区的高冬季水平。

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