美國多次NHANES普查的數據是，從1970年到2010，美國人尿碘含量（UIC）一直在往下降 （說明膳食碘的攝入量一直在減少）。
另外NCS的調查證明，目前美國孕婦的碘攝入量不夠。
在膳食碘的攝入量/尿碘含量UIC一直下降的同時，美國的甲狀腺癌發病率成倍增長。
食鹽裏的碘易揮發，碘鹽放上一兩個月，其中的碘大部分都已揮發掉了。美國人碘的主要來源不是碘鹽，而是奶製品。孕婦缺碘主要和不吃／少吃奶製品有關。
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3752509/
RESULTS:
NHANES median UI concentration in 2009-2010 (144?μg/L) was significantly lower than in 2007-2008 (164?μg/L). Non-Hispanic blacks had the lowest UI concentrations (131?μg/L) compared with non-Hispanic whites or Hispanics (147 and 148?μg/L, respectively). The median for all pregnant women in NHANES 2005-2010 was less than adequate (129?μg/L), while third trimester women had UI concentrations that were adequate (median UI 172?μg/L). Third trimester women participating in the NCS similarly had an adequate level of iodine intake, with a median UI concentration of 167?μg/L. Furthermore, NCS median UI concentrations varied by geographic location.
CONCLUSIONS:
Dairy, but not salt, seafood, or grain consumption, was significantly positively associated with median UI concentration in women of childbearing age. Pregnant women in their third trimester in the NHANES 2005-2010 had adequate median UI concentrations, but pregnant women in NHANES who were in their first or second trimesters had median UI concentrations that were less than adequate. Non-Hispanic black pregnant women from both the NHANES 2005-20010 and the NCS consistently had lower UI median concentrations than non-Hispanic whites or Hispanics.
www.health.gov/dietaryguidelines/dga2015/comments/uploads/CID54_Reference_4.pdf
另外NCS的調查證明，目前美國孕婦的碘攝入量不夠。
在膳食碘的攝入量/尿碘含量UIC一直下降的同時，美國的甲狀腺癌發病率成倍增長。
食鹽裏的碘易揮發，碘鹽放上一兩個月，其中的碘大部分都已揮發掉了。美國人碘的主要來源不是碘鹽，而是奶製品。孕婦缺碘主要和不吃／少吃奶製品有關。
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3752509/
RESULTS:
NHANES median UI concentration in 2009-2010 (144?μg/L) was significantly lower than in 2007-2008 (164?μg/L). Non-Hispanic blacks had the lowest UI concentrations (131?μg/L) compared with non-Hispanic whites or Hispanics (147 and 148?μg/L, respectively). The median for all pregnant women in NHANES 2005-2010 was less than adequate (129?μg/L), while third trimester women had UI concentrations that were adequate (median UI 172?μg/L). Third trimester women participating in the NCS similarly had an adequate level of iodine intake, with a median UI concentration of 167?μg/L. Furthermore, NCS median UI concentrations varied by geographic location.
CONCLUSIONS:
Dairy, but not salt, seafood, or grain consumption, was significantly positively associated with median UI concentration in women of childbearing age. Pregnant women in their third trimester in the NHANES 2005-2010 had adequate median UI concentrations, but pregnant women in NHANES who were in their first or second trimesters had median UI concentrations that were less than adequate. Non-Hispanic black pregnant women from both the NHANES 2005-20010 and the NCS consistently had lower UI median concentrations than non-Hispanic whites or Hispanics.
www.health.gov/dietaryguidelines/dga2015/comments/uploads/CID54_Reference_4.pdf
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